20 results on '"FERRIMAGNETIC materials"'
Search Results
2. An effective-field theory study of trilayer Ising nanostructure: Thermodynamic and magnetic properties.
- Author
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Santos, Jander P. and Sá Barreto, F.C.
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ISING model , *MAGNETIC properties , *THERMODYNAMICS , *LATTICE theory , *FERRIMAGNETIC materials , *FERRIMAGNETISM - Abstract
Thermodynamic and magnetic properties of a trilayer nanostructure of hexagonal lattices described by the spin-1/2 Ising model are investigated by the use of the effective-field theory (EFT) with correlations. The results for the magnetization, the free energy, the internal energy, the entropy, the specific heat and the critical frontiers were obtained. The critical temperature and the compensation temperature are investigated with a negative interlayer coupling, in order to clarify the distinction between the ferromagnetic and ferrimagnetic behaviors. From the thermal variations of the total magnetization, the six compensation types can be found, i.e., L-, Q-, R-, S-, P-, and N-types. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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3. Monte Carlo simulations of an Ising bilayer with non-equivalent planes.
- Author
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Diaz, I.J.L. and Branco, N.S.
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BILAYERS (Solid state physics) , *MONTE Carlo method , *THERMODYNAMICS , *ISING model , *FERRIMAGNETIC materials , *MAGNETIC properties - Abstract
We study the thermodynamic and magnetic properties of an Ising bilayer ferrimagnet. The system is composed of two interacting non-equivalent planes in which the intralayer couplings are ferromagnetic while the interlayer interactions are antiferromagnetic. Moreover, one of the planes is randomly diluted. The study is carried out within a Monte Carlo approach employing the multiple histogram reweighting method and finite-size scaling tools. The occurrence of a compensation phenomenon is verified and the compensation temperature, as well as the critical temperature for the model, are obtained as functions of the Hamiltonian parameters. We present a detailed discussion of the regions of the parameter space where the compensation effect is present or absent. Our results are then compared to a mean-field-like approximation applied to the same model by Balcerzak and Szałowski (2014). Although the Monte Carlo and mean-field results agree qualitatively, our quantitative results are significantly different. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
4. Phase diagrams and magnetic properties of ferrimagnetic mixed spin-[formula omitted] and spin-[formula omitted] Ising nanowire.
- Author
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Boughazi, B., Boughrara, M., and Kerouad, M.
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MAGNETIC properties of nanowires , *SPIN-spin coupling constants , *FERRIMAGNETIC materials , *PHASE diagrams , *ISING model , *CRITICAL exponents - Abstract
A hexagonal nanowire consisting of a ferromagnetic spin– 1 2 core and spin– 3 2 outer shell coupled with ferrimagnetic interlayer coupling has been studied by the use of the Monte Carlo simulation based on the heat bath algorithm. Particular emphasis is given to the effects of the size, the crystal field, the shell and the interface coupling constants on the critical and the compensation phenomenon. Some interesting behaviors have been observed which include the first and second order phase transitions. The isolated critical points are also observed. We have also found that the system exhibits the compensation phenomenon for appropriate values of the system parameters. The critical exponent has also been calculated. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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5. Monte Carlo study of magnetic properties and critical behavior of Sr2CrMoO6.
- Author
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Ngantso, G. Dimitri, Benyoussef, A., and El Kenz, A.
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MONTE Carlo method , *MAGNETIC properties , *STRONTIUM compounds , *CHROMIUM ions , *EXCHANGE interactions (Magnetism) , *FERRIMAGNETIC materials , *PHASE diagrams - Abstract
We performed the Monte Carlo simulation (MCs) in order to study the magnetic properties and the critical behavior of Sr 2 CrMoO 6 . Within this magnetic oxide, the Cr 3+ and Mo 5+ ions form two interpenetrating ferromagnetic sublattices with opposite spins directions (Cr 3 + up and Mo 5+ down). The exchange interaction between these sublattices is assumed to be ferrimagnetic. The effects of the system parameters on critical temperatures and as a result on the phase diagrams are shown by using reduced values of parameters. The phase transitions and the magnetic stability are investigated in the framework of Ising model. For specific values of the system parameters, the existence of a compensation point is shown. Furthermore, to investigate the critical behavior, the critical exponents are calculated, they indicate that the compound belongs to a three dimensional Ising universality class. The reduced transition temperature is also found. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
6. Mixed spin-5/2 and spin-2 Ising ferrimagnetic system on the Bethe lattice.
- Author
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Masrour, R., Jabar, A., Benyoussef, A., and Hamedoun, M.
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SPIN-spin interactions , *ISING model , *FERRIMAGNETIC materials , *MAGNETIZATION , *MAGNETIC fields - Abstract
The magnetic properties of spins -S and σ Ising model on the Bethe lattice have been investigated by using the Monte Carlo simulation. The thermal total magnetization and magnetization of spins S and σ with the different exchange interactions, different external magnetic field and different temperatures have been studied. The critical temperature and compensation temperature have been deduced. The magnetic hysteresis cycle of Ising ferrimagnetic system on the Bethe lattice has been deduced for different values of exchange interactions between the spins S and σ , for different values of crystal field and for different sizes. The magnetic coercive filed has been deduced. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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7. Computational study of magnetic properties of L10 ordered FeNi and FePt binary alloys.
- Author
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Obeidat, Abdalla, Aladerah, Bilal, and Qaseer, Mohammad-Khair
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BINARY metallic systems , *MAGNETIC properties , *CRITICAL temperature , *MONTE Carlo method , *SPECIFIC heat , *MAGNETIC susceptibility , *FERRIMAGNETIC materials - Abstract
• The critical temperature of FeNi and FePt alloys using Heisenberg interaction is closer to the experimental value than the Ising interaction. • The FeNi and FePt alloys prefer a ferromagnetic phase over the ferrimagnatic phase. • The Ising interaction predicts higher critical temperature for the FeNi alloy than the Heisenberg interaction. • The Heisenberg interaction predicts higher critical temperature for the FePt alloy than the Ising interaction. A Monte Carlo simulation has been used to explore the magnetic properties of L1 0 ordered FeNi and FePt binary alloys. Our Hamiltonians include Heisenberg interaction or Ising interaction. Our calculations of variations of specific heat C v , magnetic susceptibility χ and the magnetization M with the temperature T showed that predicted critical temperature for ferromagnetic phase is very close to the experimental values for these alloys. Also, thermal hysteresis loops, magnetic remanence, and the coercive field have been calculated. Moreover, the magnetic properties of the ferrimagnetic phase are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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8. Monte Carlo simulation of magnetic properties of a mixed spin-1 and spin-3/2 ferrimagnetic Ising system.
- Author
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Masrour, R., Jabar, A., Benyoussef, A., and Hamedoun, M.
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FERRIMAGNETIC materials , *MAGNETIC properties , *ISING model , *MAGNETIZATION , *HYSTERESIS , *CRYSTAL field theory , *MONTE Carlo method - Abstract
Monte Carlo simulation has been used to study the magnetic properties of a mixed spin-1 and spin-3/2 ferrimagnetic through Ising model on a honeycomb lattice. The total magnetization, magnetization of sublattice A with spin 1 and sublattice B with spin 3/2 are studied for different values of exchange interactions, for a zero crystal field and for different values of a magnetic field. The total magnetization versus the exchange interactions J AB / J AA for different values of crystal field of two sublattices is given. Magnetic hysteresis cycles of system and sublattices are given for different values of exchange interactions and crystal field. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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9. Phase diagrams and compensation behaviors of a mixed Spin-(3/2, 1) Ising-Type Ferrimagnet: Monte Carlo investigation.
- Author
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Elidrysy, A., Harir, S., Zouhair, A., and Y.Boughaleb
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FERRIMAGNETIC materials , *PHASE diagrams , *MAGNETIC crystals , *MONTE Carlo method , *ISING model , *MAGNETIC fields - Abstract
• The mixed spin Ising model is generally used as a modeling tool to study ferrimagnetism. • Monte Carlo simulation to study the critical and the compensation behaviors of a cubic lattice considering a mixed spin- 3/2 and spin-1 Ising ferrimagnetic model. • The presence of crystal and external magnetic fields is not sufficient to generate the compensation phenomenon in a mixed spins. In this study, we perform Monte Carlo simulations to study the magnetic properties of a mixed Ising model on a cubic lattice where spins S i A = 1 and σ J B = 3/2 are located in sublattice A and B, respectively. The proposed Hamiltonian includes coupling to nearest-neighbors interactions, next-nearest-neighbors interactions, crystal fields D S and D σ and external magnetic field h. We perform exact ground-state calculations for our model. The obtained results show the behavior of the critical temperature with the presence of the compensation temperatures under a certain range of parameters. Particularly, we found that the existence of compensation temperatures depends on the strength of the coupling to the next nearest neighbors between the S i A spins and between the σ J B spins, and it appears in a certain range of values of the external magnetic and crystal field of different spins. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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10. The phase diagrams and the magnetic properties of a ferrimagnetic mixed spin 1/2 and spin 1 Ising nanowire.
- Author
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Boughrara, M., Kerouad, M., and Zaim, A.
- Subjects
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PHASE diagrams , *MAGNETIC properties , *FERRIMAGNETIC materials , *ISING model , *NANOWIRES , *MONTE Carlo method , *FIELD theory (Physics) - Abstract
Abstract: In this work, we have used Monte Carlo Simulation technique (MCS) and effective field theory (EFT) to study the critical and the compensation behaviors of a ferrimagnetic cylindrical nanowire. The system consists of a ferromagnetic spin S A =1/2 core and a ferromagnetic spin S B =1 surface shell coupled with an antiferromagnetic interlayer coupling J 1 to the core. The effects of the uniaxial anisotropy, the shell coupling and the interface negative coupling on both the critical and compensation temperatures are investigated. [Copyright &y& Elsevier]
- Published
- 2014
- Full Text
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11. Phase diagrams and magnetic properties of a ferrimagnetic cylindrical core/shell spin-1 Ising nanowire.
- Author
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Boughazi, B., Boughrara, M., and Kerouad, M.
- Subjects
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PHASE diagrams , *MAGNETIC properties , *FERRIMAGNETIC materials , *CYLINDRICAL shells , *ISING model , *NANOWIRES , *MONTE Carlo method - Abstract
Abstract: A Monte Carlo Simulation has been used to study the critical behavior of the magnetic spin-1 Ising nanowire on an hexagonal lattice structure. Our system consists of a ferromagnetic core with two shells, coupled antiferromagnetically with a surface shell. The effects of the crystal field, the shell and the core/shell interactions on the behavior of the system are examined. We found that the system exhibits one or two compensation points, the first and the second order transitions. Moreover, we have obtained that the critical point depends on the shell coupling. [Copyright &y& Elsevier]
- Published
- 2014
- Full Text
- View/download PDF
12. Critical and compensation temperature in a ferrimagnetic mixed spin Ising trilayer nano-graphene superlattice.
- Author
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Boubekri, Abderrazak, Elmaddahi, Zakaria, Farchakh, Abdeslam, and El Hafidi, Mohamed
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FERRIMAGNETIC materials , *CRITICAL temperature , *HYSTERESIS loop , *ISING model , *CRITICAL point (Thermodynamics) , *MAGNETIC properties , *ANISOTROPY - Abstract
An effective field method has been employed to study the magnetic properties of a ferrimagnetic mixed-spin Ising trilayer nanographene structure. The system is formed by alternate layers of two different spins atoms A (spin-1) and B (spin-½) arranged in a particular fashion A – B – A for which the nearest-neighbor spins of each layer are coupled ferromagnetically (J A and J B), whereas the cross atom interaction A - B (interlayer) is antiferromagnetic (J AB). We examined the effects of interlayer (or intra-layer) exchange coupling and single-ion anisotropy on the magnetization curves of the system. We found that the antiferromagnetic inter-layers (J AB < 0) coupling and the single-ion anisotropy have a dominant factor in the occurrence of the single or the double compensation temperature. We also deeply examined the occurrence of hysteresis loops and their various unusual forms. The results obtained are discussed in detail as a function of the main parameters of the magnetic Hamiltonian. Finally, we noticed that our results are in line with other recently reported theoretical and numerical studies. • Ferrimagnetic spin mixed with nano-graphene trilayer Ising model on effective field approach has been considered. • Effects of Intra- and inter-layers exchange couplings, as well as single-ion anisotropy have been analyzed. • One or more compensation points can be obtained under special choice of intrinsic parameters. • The shape and the multi-windows hysteresis loops can be controlled through exchange or single-ion anisotropy. • Application of synthetic ferrimagnetic multilayers are outlined. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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13. Magnetic properties of the ferrimagnetic triangular nanotube with core–shell structure: A Monte Carlo study.
- Author
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Gharaibeh, Maen, Alqaiem, Samah, Obeidat, Abdalla, Al-Qawasmeh, Ahmad, Abedrabbo, Sufian, and Badarneh, Mohammad H.A.
- Subjects
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FERRIMAGNETIC materials , *MAGNETIC properties , *MAGNETIC transitions , *MAGNETIC anisotropy , *HYSTERESIS loop , *NANOTUBES , *MONTE Carlo method - Abstract
Monte Carlo simulation has been employed to investigate the magnetic properties and phase diagrams of ferrimagnetic mixed-spin (1 / 2 , 1) triangular Ising nanotube with core–shell structure. In particular, the effect of the exchange couplings and the temperature on the magnetic and thermodynamic properties, hysteresis loops, and the compensation temperature have been discussed in detail. Moreover, the effects of the single-ion anisotropy and external magnetic field have been examined. The threshold values of the exchange couplings and single-ion anisotropy have been found, determining whether the system exhibits a compensation temperature. We have found that the appearance of the compensation temperature is strongly linked with the system parameters. Moreover, we have obtained the double and triple hysteresis loops for certain physical parameters in the magnetic system. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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14. The magnetic properties and hysteresis loops of mixed spin-(3/2,2) hexagonal Ising nanowire system with alternate layers.
- Author
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Nmaila, B., Htoutou, K., Drissi, L.B., and Laamara, R. Ahl
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FERRIMAGNETIC materials , *MAGNETIC hysteresis , *HYSTERESIS loop , *MAGNETIC properties , *NANOWIRES , *MONTE Carlo method , *SPECIFIC heat , *COUPLING constants - Abstract
In this paper, we have examined in detail the behavior of magnetic properties, hysteresis loops, and compensation phenomenon of a ferrimagnetic mixed spin- (3 ∕ 2 , 2) hexagonal Ising nanowire with alternate layers within the Monte Carlo method based on the Metropolis algorithm. The effect of longitudinal crystal field and exchange coupling constants on the total and the sublattice magnetizations, susceptibilities, specific heat, internal energy, as well as hysteresis loops are investigated for particular parameters. The obtained résults showed different interesting magnetic phenomena, such as seven and triple hysteresis loops at low temperatures, and one or double compensation temperatures under certain parameter values. Our outcomes are also compared with various experimental and theoretical studies. • A hexagonal mixed spin-3/2 and spin-2 Ising ferrimagnetic nanowire with alternate layers, within Monte Carlo simulation techniques. • The effects of the longitudinal crystal fields, the exchange coupling constant, and the temperature on the thermodynamic and magnetic properties and the hysteresis loops were examined in detail. • The seven and triple hysteresis loops at low temperatures, and double compensation temperatures under certain physical parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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15. Susceptibility and magnetic properties of a trilayer Ising nanostructure: An effective-field theory.
- Author
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Santos, J.P., Francisco, R.M., and Mendes, R.G.B.
- Subjects
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MAGNETIC susceptibility , *MAGNETIC properties , *ISING model , *CRITICAL temperature , *MAGNETIZATION , *FERRIMAGNETIC materials - Abstract
Magnetic properties of a trilayer nanostructure of hexagonal lattices described by the spin-1/2 Ising model are investigated via the effective-field theory (EFT) with correlations. In order to clarify the distinction between the ferromagnetic and ferrimagnetic behaviors, the total magnetization, total susceptibility, total inverse susceptibility and critical boundaries have been obtained for positive and negative interlayers couplings. From thermal variations, some magnetic compensation types are found for the ferrimagnetic system. The specificities of the susceptibilities when the magnetizations present compensation temperatures have been also studied. • Correlation identities on a nanostructure of hexagonal lattices are obtained. • From the spin correlation identities the effective-field theory is applied. • The total magnetization and total susceptibility are obtained. • The critical temperature and the compensation temperature are investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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16. Magnetodielectric coupling in Ca3Co2O6 triangular Ising lattice
- Author
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Bellido, Natalia, Simon, Charles, and Maignan, Antoine
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SPINTRONICS , *DIELECTRICS , *CALCIUM compounds , *ISING model , *MAGNETIC properties , *FERRIMAGNETISM , *FERROMAGNETIC materials , *PERMITTIVITY - Abstract
Abstract: Geometric frustration in magnetic systems is a key ingredient for magnetodielectric coupling. Ca3Co2O6 system is a model of triangular Ising lattice and presenting exotic magnetic properties. With a partially disordered antiferromagnetic ground state and two steps in magnetisation to a ferrimagnetic state and to a ferromagnetic state, this oxide is a good system for studying the effect of frustration in magnetodielectric coupling. Dielectric constant measurements of single crystals of Ca3Co2O6 have been done showing the sensitivity of this technique to frustration. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
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17. Cluster size effects in the magnetic properties of [formula omitted]-[formula omitted] alloys.
- Author
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Santos-Filho, J.B., Santos Sá, A.V., de Araujo Batista, T.S., and Plascak, J.A.
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MONTE Carlo method , *MAGNETIC properties , *ISING model , *ALLOYS , *CRITICAL temperature , *PHASE diagrams , *FERRIMAGNETIC materials - Abstract
• Critical properties of Fe-Al alloys in the bcc phase – phase diagram. • Ising model with exchange and superexchange interactions. • Monte Carlo simulations taking the effects of the Al cluster sizes. A spin-1/2 Ising model, defined in the body centered cubic lattice, is used to describe some of the thermodynamic properties of Fe p - Al q alloys, with p + q = 1. The model assumes, besides the nearest-neighbor exchange coupling, the existence of further next-nearest-neighbor superexchange interactions, where the latter ones depend on the aluminum atoms cluster size. The Ising system so considered is studied by employing Monte Carlo simulations, using a hybrid algorithm consisting of one single-spin Metropolis move together with one single-cluster Wolff algorithm allied, in addition, with single histograms procedures and finite-size scaling techniques. Quite good fits to the experimental results of the ordering critical temperature, as a function of Al concentration in the range 0 ⩽ q < 0.7 , are obtained and compared to more recent theoretical approaches done on the same alloys. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
18. Study on magnetic and thermodynamic characteristics of core-shell graphene nanoribbon.
- Author
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Si, Nan, Wang, Jiu-Ming, Guo, An-Bang, Zhang, Fan, Zhang, Feng-Ge, and Jiang, Wei
- Subjects
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MAGNETIC anisotropy , *FERRIMAGNETIC materials , *MAGNETIC properties , *ISING model , *MAGNETIC fields , *MAGNETIZATION - Abstract
Magnetic and thermodynamic characteristics of Ising ferrimagnetic core-shell graphene nanoribbon with core spin −2 and shell spin 5/2 were investigated by using the effective field theory with correlations. Some characteristic phenomena have been found in the system. Different saturation magnetization and P-type and Q-type curves were found on the magnetization curves. At low temperature, the magnetization has obvious magnetization platform. Due to the results of exchange coupling, anisotropy and external magnetic field competition, the m 5 -m 7 sublattice magnetization platform presents a concave shape. The results obtained may have potential applications in the design of nanodevices. • Ising model of core-shell structure graphene nanoribbon is suggested. • Magnetic properties of the system have been studied. • Spin-flip or spin-flop has been found on the magnetization curves. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
19. Magnetic properties of an Ising ladder-like graphene nanoribbon by using Monte Carlo method.
- Author
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Yang, Min, Wang, Wei, Li, Bo-chen, Wu, Hao-jia, Yang, Shao-qing, and Yang, Jun
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MAGNETIC properties , *FERRIMAGNETIC materials , *MAGNETIC fields , *HYSTERESIS loop , *ISING model , *MONTE Carlo method , *PHASE diagrams - Abstract
In this paper, we proposed a ferrimagnetic mixed-spin (1, 3/2) Ising model to describe the ladder-like graphene nanoribbon. Using the Monte Carlo simulation, the effects of the anisotropies, exchange couplings, longitudinal magnetic field and temperature on the magnetic and thermodynamic properties were investigated. Typical temperature dependences of thermodynamics quantities such as magnetization, susceptibility and internal energy were presented under the influence of various physical parameters. The phase diagrams of blocking temperature were obtained in the different parameter planes. In particular, we also found some interesting double hysteresis loops behavior for certain physical parameters. Our results are consistent with those obtained by some theoretical and experimental researches. • The ferrimagnetic mixed-spin (1, 3/2) Ising ladder-like graphene nanoribbon in the longitudinal magnetic field has been studied. • Magnetization, susceptibility and internal energy have been discussed. • The phase diagrams of the blocking temperature under the influence of different parameters have been obtained. • The double hysteresis loops behavior has been found for certain physical parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
20. Unique magnetic and thermodynamic properties of a zigzag graphene nanoribbon.
- Author
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Wang, Xue-Sheng, Zhang, Fan, Si, Nan, Meng, Jing, Zhang, Yan-Li, and Jiang, Wei
- Subjects
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MAGNETIC properties , *FERRIMAGNETIC materials , *MONTE Carlo method , *RANDOM access memory , *SPECIFIC heat , *ISING model - Abstract
Magnetic and thermodynamic properties of the zigzag graphene nanoribbon described by Ising model have been studied within Monte Carlo simulation. The system exhibited interesting and rich magnetization plateaus behaviors at low temperature, which is sensitive to the exchange coupling and the anisotropy. In certain parameters, the depressed saturation magnetization, spin-flip or spin-flop has been found on the magnetization curves. The peaks on the susceptibility and specific heat curves originate from competition among the magnetic field, the exchange couplings and anisotropies. The spin configurations of the zigzag graphene nanoribbon can be modulated by the anisotropies. Our results can provide an opportunity for the design of a new type random access memory by using zigzag graphene nanoribbon. • Ising model of zigzag graphene nanoribbon is suggested. • Magnetic properties of the system have been studied. • spin-flip or spin-flop has been found on the magnetization curves. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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