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3. Differentiation between strain and charge mediated magnetoelectric coupling in La$_{0.7}$Sr$_{0.3}$MnO$_{3}$/Pb(Mg$_{1/3}$Nb$_{2/3}$)$_{0.7}$Ti$_{0.3}$O$_{3}$(001)

Author

Bhatnagar-Schöffmann, Tanvi, Kentzinger, E., Sarkar, A., Schöffmann, Patrick, Lan, Q., Jin, L., Kovács, A., Grutter, A. J., Kirby, B. J., Beerwerth, R., Waschk, M., Stellhorn, Annika, Rücker, U., Dunin-Borkowski, Rafal Edward, and Brückel, Thomas

Subjects
ddc:530
Abstract

New journal of physics 23(6), 063043 (2021). doi:10.1088/1367-2630/ac04c7, Published by Dt. Physikalische Ges., [Bad Honnef]

Published
2021
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6. Structural and magnetic properties of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\lbrack$\end{document} \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\rbrack$\end{document}Er|Tb\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\lbrack$\end{document} \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\rbrack$\end{document}multilayers

Author

Voigt, J., Kentzinger, E., Rücker, U., Schweika, W., Wermeille, D., Schmidt, W., and Brückel, Th.

Published
2006
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12. Control of the stripe domain pattern in L10-ordered FePd thin films

Author

Stellhorn, A., Sarkar, A., Kentzinger, E., Waschk, Markus, Schöffmann, P., Schröder, Sonja, Abuladze, G., Fu, Z., Pipich, Vitaliy, and Brückel, Thomas

Subjects
ddc:530
Abstract

Journal of magnetism and magnetic materials : MMM 476, 483-486 (2019). doi:10.1016/j.jmmm.2018.12.059, Published by North-Holland Publ. Co., Amsterdam

Published
2019
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17. Differentiation between strain and charge mediated magnetoelectric coupling in La0.7Sr0.3MnO3/Pb(Mg1/3Nb2/3)0.7Ti0.3O3(001).

Author

Bhatnagar-Schöffmann, T, Kentzinger, E, Sarkar, A, Schöffmann, P, Lan, Q, Jin, L, Kovács, A, Grutter, A J, Kirby, B J, Beerwerth, R, Waschk, M, Stellhorn, A, Rücker, U, Dunin-Borkowski, R E, and Brückel, Th

Subjects
*NEUTRON reflectometry, *SCATTERING (Physics), *TRANSMISSION electron microscopy, *DEPTH profiling, *LEAD titanate, *VOLTAGE control
Abstract

Magnetoelectric (ME) coupling in La0.7Sr0.3MnO3/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (LSMO/PMN–PT (001)) has been probed in the past years to identify the underlying mechanism behind it. PMN–PT, which is well known for its excellent piezoelectric properties, also exhibits ferroelectricity. This motivates our interest to differentiate which effect is dominant for this 'voltage control of magnetism'. Here, we present results for the ME coupling at different temperatures: 300 K and 80 K. In this article we discuss and explain, how the nature of ME coupling is influenced by different parameters such as magnetic field, electric field, directional dependence (hard axis, easy axis) and temperature. Owing to large lattice mismatch between LSMO and PMN–PT, the strain-mediated coupling is strongly prevalent, however the change in strain behaviour from butterfly loop to linear loop is observed as a function of temperature. ME measurements are performed along hard axis [100] and easy axis [110] of LSMO in the presence of remanent magnetic field which showcases the pure influence of electric field on the system, resulting in a combination of strain- and charge-mediated coupling. The magnetic depth profile is probed by polarized neutron reflectometry as a function of electric field which demonstrates the existence of an interlayer with reduced nuclear scattering length density and reduced magnetic scattering length density at the interface. From transmission electron microscopy, stoichiometric variations are observed due to the presence of Mn3O4 particles at the interface. [ABSTRACT FROM AUTHOR]

Published
2021
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18. Structural and magnetic properties of $\lbrack$ErTb$\rbrack$multilayers

Author

Voigt, J., Kentzinger, E., Rücker, U., Schweika, W., Wermeille, D., Schmidt, W., and Brückel, Th

Subjects
Condensed Matter::Materials Science
Abstract

We have investigated the structural and magnetic properties of $\lbrack$ Er|Tb $\rbrack$ multilayers by different scattering methods. Diffuse X-ray scattering under grazing incidence reveals the interface structure in $\lbrack$ Er|Tb $\rbrack$ bilayers and trilayers, indicating vertically correlated roughness between the Er and Tb interfaces. The magnetic properties of $\lbrack$ ErnEr|TbnTb $\rbrack$ superlattices have been studied as a function of the superlattice composition (indices denote the number of atomic layers). Coupled ferromagnetic structures exist in all investigated samples. The phase transition temperature varies with the Tb layer thickness. Modulated magnetic order is short range for all samples beside the $\lbrack$ Er20|Tb5 $\rbrack$ superlattice, the sample with the smallest Tb layer thickness. We observe dipolar antiferromagnetic coupling between single ferromagnetic Tb layers in all samples, with the onset of this ordering depending on the Tb layer thickness. Due to competing interactions, exchange coupling is limited to the interface near region. Therefore long range modulated magnetic order is observed in the $\lbrack$ Er20|Tb5 $\rbrack$ superlattice only, where the interface regions overlap. The distinct differences to the magnetic structure of an Er0.8Tb0.2 alloy film are explained by a highly anisotropic arrangement of neighbouring atoms due to the correlated roughness

Published
2018

24. Smectic phase in suspensions of gapped DNA duplexes

Author

Salamonczyk, M, Zhang, J, Portale, G, Zhu, C, Kentzinger, E, Gleeson, JT, Jakli, A, De Michele, C, Dhont, JKG, Sprunt, S, Stiakakis, E, and Macromolecular Chemistry & New Polymeric Materials

Subjects
Models, Molecular, Science, Temperature, Molecular, DNA, Single-Stranded, DNA, Article, Phase Transition, Liquid Crystals, Single-Stranded, Models, Nucleic Acid Conformation, Thermodynamics, ddc:500, Monte Carlo Method
Abstract

Smectic ordering in aqueous solutions of monodisperse stiff double-stranded DNA fragments is known not to occur, despite the fact that these systems exhibit both chiral nematic and columnar mesophases. Here, we show, unambiguously, that a smectic-A type of phase is formed by increasing the DNA's flexibility through the introduction of an unpaired single-stranded DNA spacer in the middle of each duplex. This is unusual for a lyotropic system, where flexibility typically destabilizes the smectic phase. We also report on simulations suggesting that the gapped duplexes (resembling chain-sticks) attain a folded conformation in the smectic layers, and argue that this layer structure, which we designate as smectic-fA phase, is thermodynamically stabilized by both entropic and energetic contributions to the system's free energy. Our results demonstrate that DNA as a building block offers an exquisitely tunable means to engineer a potentially rich assortment of lyotropic liquid crystals., DNA can be used as a tunable building block to create a variety of self-assembly-driven liquid crystals. Here, the authors report the stabilization of a smectic-A liquid crystal phase, where constituent molecules—two rigid dsDNA segments linked by a flexible ssDNA spacer—attain a folded configuration.

Published
2016

31. Neutron adiabaticity and its impact on data analysis, illustrated for polarized GISANS

Author

Stellhorn Annika, Lee Wai-Tung, Kentzinger Emmanuel, Chen Wangchun, Gaudet Jonathan, Krycka Kathryn, and Blackburn Elizabeth

Subjects
Physics, QC1-999
Abstract

The significance of neutron spin adiabaticity in the data analysis of polarized Grazing Incidence Small Angle Neutron Scattering (GISANS) is discussed, with the aim of minimizing the number of simulation parameters of complex magnetic models within the neutron scattering cross-section. We illustrate how an estimate of the neutron polarization direction and adiabaticity can be obtained by magnetic field and neutron ray-tracing simulations and compare the results with measurements of the magnetic field map for the beamline used in the GISANS experiment. We show how small deviations from the neutron polarization direction with respect to the magnetic field vector at the sample position significantly affect the data analysis, and how this can be considered within the magnetic model of the scattering cross section using the Distorted Wave Born Approximation.

Published
2023
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47. Lattice dynamics and migration enthalpies inCoPt3and FePd

Author

Mehaddene, T., primary, Kentzinger, E., additional, Hennion, B., additional, Tanaka, K., additional, Numakura, H., additional, Marty, A., additional, Parasote, V., additional, Cadeville, M. C., additional, Zemirli, M., additional, and Pierron-Bohnes, V., additional

Published
2004
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