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469 results on '"Liu, J. Ping"'

5. Metallic Magnetic Materials

Author

Liu, J. Ping, Willard, Matthew, Tang, Wei, Brück, Ekkes, de Boer, Frank, Liu, Enke, Liu, Jian, Felser, Claudia, Fecher, Gerhard, Wollmann, Lukas, Isnard, Olivier, Burzo, Emil, Liu, Sam, Herbst, J. F., Hu, Fengxia, Liu, Yao, Sun, Jirong, Shen, Baogen, de Visser, Anne, Coey, J. M. D., editor, and Parkin, Stuart S.P., editor

Published
2021
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11. Metal–Organic Framework as a New Type of Magnetothermally‐Triggered On‐Demand Release Carrier

Author

Ge, Xueying, primary, Mohapatra, Jeotikanta, additional, Silva, Enya, additional, He, Guihua, additional, Gong, Lingshan, additional, Lyu, Tengteng, additional, Madhogaria, Richa P., additional, Zhao, Xin, additional, Cheng, Yuchuan, additional, Al‐Enizi, Abdullah M., additional, Nafady, Ayman, additional, Tian, Jian, additional, Liu, J. Ping, additional, Phan, Manh‐Huong, additional, Taraballi, Francesca, additional, Pettigrew, Roderic I., additional, and Ma, Shengqian, additional

Published
2023
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12. Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory

Author

Zhang, Xichao, Zhao, G. P., Fangohr, Hans, Liu, J. Ping, Xia, W. X., Xia, J., and Morvan, F. J.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Magnetic skyrmions are promising for building next-generation magnetic memories and spintronic devices due to their stability, small size and the extremely low currents needed to move them. In particular, skyrmion-based racetrack memory is attractive for information technology, where skyrmions are used to store information as data bits instead of traditional domain walls. Here we numerically demonstrate the impacts of skyrmion-skyrmion and skyrmion-edge repulsions on the feasibility of skyrmion-based racetrack memory. The reliable and practicable spacing between consecutive skyrmionic bits on the racetrack as well as the ability to adjust it are investigated. Clogging of skyrmionic bits is found at the end of the racetrack, leading to the reduction of skyrmion size. Further, we demonstrate an effective and simple method to avoid the clogging of skyrmionic bits, which ensures the elimination of skyrmionic bits beyond the reading element. Our results give guidance for the design and development of future skyrmion-based racetrack memory., Comment: 15 pages, 6 figures

Published
2014
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17. Size-dependent spin-reorientation transition in Nd2Fe14B nanoparticles

Author

Rong, Chuanbing, Poudyal, Narayan, and Liu, J. Ping

Subjects
Condensed Matter - Materials Science
Abstract

Nd2Fe14B magnetic nanoparticles have been successfully produced using a surfactant-assisted ball milling technique. The nanoparticles with different size about 6, 20 and 300 nm were obtained by a size-selection process. Spin-reorientation transition temperature of the NdFeB nanoparticles was then determined by measuring the temperature dependence of DC and AC magnetic susceptibility. It was found that the spin-reorientation transition temperature (Tsr) of the nanoparticles is strongly size dependent, i.e., Tsr of the 300 nm particles is lower than that of raw materials and a significant decrease was observed in the 20 nm particles.

Published
2010
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40. Microstructure and Magnetic Anisotropy of SmCo‐Based Films Prepared via External Magnetic Field Assisted Magnetron Sputtering.

Author

Li, Hao, Wei, Lu, Hong, Yuan, Zhang, Yuanwei, Qiu, Zhaoguo, Wang, Gang, Zhao, Lizhong, Liu, Xiaolian, Zhang, Xuefeng, Chen, Deyang, Zheng, Z. G., Xia, Weixing, Zeng, Dechang, and Liu, J. Ping

Subjects
MAGNETIC anisotropy, MAGNETIC fields, RAPID thermal processing, MAGNETIC moments, MAGNETIC control, MAGNETRON sputtering
Abstract

SmCo‐based thin films have excellent permanent magnetic properties for application in magnetic functional devices. The conventional methods to control the magnetic anisotropy are inserting the suitable buffer layer or applying magnetic field heat treatment. However, the selection of the buffer layer and the thickness of the SmCo layer are limited. Additionally, the magnetic field heat treatment is detrimental to suppressing the grain growth. Herein, the SmCo‐based thin films by magnetic field assisted magnetron sputtering followed by a rapid thermal annealing (RTA) is prepared. The characteristic diffraction peak of SmCo5 (200) with in‐plane orientation disappears, indicating that the in‐plane magnetic anisotropy could be further decreased. Meanwhile, the out‐of‐plane coercivity highly increases when applying an external magnetic field, which is contributed partly by the refined SmCo grains under the external magnetic field due to the reduction of critical free energy of Sm–Co cluster nucleation. Furthermore, micromagnetic simulations indicates that the out‐of‐plane magnetic moments of Sm2Co17 phase are more difficult to reverse because the ratio of in‐plane and out‐of‐plane oriented moments changed from 1:1 to 1:1.4, and proves that the proportion of magnetic moment direction is significant to control magnetic anisotropy and coercivity which is consistent with the experiment results. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Structural, magnetic, and magnetocaloric properties of chromium doped Gd3Fe5-xCrxO12 garnet compound.

Author

Sultana, Jolaikha, Mohapatra, Jeotikanta, Liu, J. Ping, and Mishra, Sanjay R.

Subjects
MAGNETIC entropy, GARNET, MAGNETIC cooling, CHROMIUM, MAGNETICS, CURIE temperature, DIFFRACTION patterns
Abstract

The detailed structural, magnetic, and cryogenic magneto-caloric properties of chromium-substituted gadolinium iron garnet (Gd3Fe5-xCrxO12) nanocrystalline powders were studied using the facile autocombustion method and a calcination temperature of 1100 °C. The X-ray diffraction pattern showed that all samples were single-phase with cubic Ia3d symmetry. The temperature and field-dependent magnetization data of Gd3Fe5-xCrxO12 samples revealed a ferrimagnetic ordering at low temperatures. Upon Cr3+ substitution, the Curie temperature reduced by 7% at x = 0.25 from 560 K for x = 0.00 sample. In a field up to 5 T, the maximum magnetic entropy change was observed as ΔSM ∼ 3.8 J K−1 kg−1 for x = 0.00 and −ΔSM ∼ 3.9 J K−1 kg−1 for x = 0.25 sample, while the maximum relative cooling power, RCP, value of 420 J kg−1 was measured for x = 0.25 sample, which is 10% larger than the x = 0.00 (RCP ∼ 380 J kg−1). Therefore, Cr3+ substituted Gd3Fe5-xCrxO12 samples exhibit promising magneto-caloric performance and have potential low-temperature magnetic refrigeration applications. [ABSTRACT FROM AUTHOR]

Published
2023
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42. Microstructure and Magnetic Anisotropy of SmCo‐Based Films Prepared via External Magnetic Field Assisted Magnetron Sputtering

Author

Li, Hao, primary, Wei, Lu, additional, Hong, Yuan, additional, Zhang, Yuanwei, additional, Qiu, Zhaoguo, additional, Wang, Gang, additional, Zhao, Lizhong, additional, Liu, Xiaolian, additional, Zhang, Xuefeng, additional, Chen, Deyang, additional, Zheng, Z. G., additional, Xia, Weixing, additional, Zeng, Dechang, additional, and Liu, J. Ping, additional

Published
2022
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46. Optimal sampled phase-only hologram (OSPOH)

Author

Tsang, P. W. M., Liu, J. Ping, Lam, H., and Poon, T. C.

Subjects
0906 Electrical and Electronic Engineering, PROJECTION, IMAGE, Computer Science::Computer Vision and Pattern Recognition, 0205 Optical Physics, 1005 Communications Technologies, Physics::Optics, Optics, ALGORITHM, GENERATION
Abstract

A sampled phase-only hologram (SPOH) is the phase component of the hologram of an object image with pixels being sampled with a periodic grid-cross pattern. The reconstructed image of a SPOH is a sparse image with abundant empty voids and degradation in sharpness and contrast. In this paper we proposed a method based on a new sampling scheme, together with stochastic binary search (SBS), to obtain an optimal sampling lattice that can be applied to generate phase-only holograms with enhanced reconstructed image. Experimental results show that with our proposed method, the fidelity and quality of the reconstructed image are increased. Published version

Published
2021

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