Article
Materials Science, Multidisciplinary
N. Yu Pankratov, I. S. Tereshina, G. A. Politova, T. A. Aleroeva, A. Filimonov, P. Yu Vanina, O. A. Alekseeva, J. Cwik, Yu S. Koshkid'ko, A. S. Ilyushin
Summary: The study investigates the structural and magnetic properties of Sm0.2Y0.8Fe2 intermetallic compound compared to SmFe2 compound, finding that the substitution of Y for Sm leads to a decrease in Curie temperature and spin-reorientation transition temperatures. The complex behavior of magnetostriction in a wide temperature range is discussed in terms of single-ion anisotropy and magnetostriction theory, considering factors such as the state of Sm3+ ions and competition between contributions from iron and samarium sublattices.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Applied
Xinwei Feng, Yangping Wang, Jing Meng, Haoyu Lin, Xiaoyan Zhu, Yali Xie, Dongmei Jiang, Yang Xu, Tian Shang, Qingfeng Zhan
Summary: We report variable in-plane fourfold magnetic anisotropy in epitaxial exchange-biased Fe/IrMn bilayers with different layer thicknesses. The fourfold magnetic anisotropy of the bilayers continuously decreases and even appears negative as the thickness of the Fe layer decreases. As the IrMn thickness increases, the fourfold magnetic anisotropy of the bilayers decreases rapidly from a value close to the intrinsic magnetocrystalline anisotropy of Fe and then gradually reaches saturation. The extrinsic fourfold magnetic anisotropy depends on the amount of the induced uncompensated IrMn spins near the edge of antiferromagnetic domains.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Hung-Hsiang Yang, Chuan-Che Hsu, Kanta Asakawa, Wen-Chin Lin, Yukio Hasegawa
Summary: The study found that alloy islands exhibit the same ferromagnetic behavior as pure islands, but with significantly reduced coercivity, approximately 40% of that of pure islands. Through model calculations and tunneling spectroscopy analysis, it was shown that fewer electrons in the valence band of alloy islands are responsible for the reduction in magnetic anisotropy energy.
Article
Physics, Applied
Yohei Kota, Akimasa Sakuma
Summary: In this study, the effects of light elements addition (C, N) on the magnetic properties in FeCo and FeNi ordered alloys were investigated using first-principles calculations. FeNiC0.5 was found to be the most promising alloy with an expected increase in the Curie temperature and uniaxial magnetic anisotropy constant. The mechanism for the enhancement of these properties can be explained by the basic concepts of magnetism.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Hung Ba Tran, Hiroyoshi Momida, Yu-ichiro Matsushita, Kazunori Sato, Yukihiro Makino, Koun Shirai, Tamio Oguchi
Summary: The effective magnetocrystalline anisotropy energy follows a power law of magnetization in the Callen-Callen theory, with different effects observed in uniaxial vs. cubic anisotropy cases. The estimation of magnetocrystalline anisotropy energy at different temperatures sheds light on the magnetic properties at play, particularly the limitations in cubic anisotropy cases. This study also supports previous experimental evidence of magnetic anisotropy at temperatures slightly above the Curie temperature.
Article
Materials Science, Multidisciplinary
Ruiwen Xie, Hongbin Zhang
Summary: This study investigates the magnetization and electronic structure of the CeCo5 system using the DFT + DMFT approach, revealing a significant reduction in the magnetic moment of the Ce-4f shell and contrasting magnetic moment changes of Ce in different alloys.
Article
Materials Science, Multidisciplinary
Linhan Yin, Yongquan Guo, Xinpeng Guo
Summary: A high-entropy intermetallic compound (La1/4Pr1/4Nd1/4Sm1/4)(2)Co-17 is designed and prepared. It exhibits excellent magnetic properties and a stabilized structure. The high entropy not only stabilizes the La2Co17 phase but also improves the magnetic properties.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Engineering, Electrical & Electronic
Jinpeng Zhong, Guoguo Tan, Qikui Man, Mingqiang Ning, Yu Gao, Xincai Liu, Jing Pan
Summary: This study investigates the magneto-crystalline anisotropy materials as effective microwave absorption materials. The magnetic and microwave absorption properties of Y2Co17-xFex were studied, showing changes in anisotropy and absorption performance with varying Fe content. The Y2Co17-xFex/paraffin composite with x = 9 exhibited the strongest reflection loss, suggesting its potential as an efficient microwave absorbent at gigahertz frequencies.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Phillip David Bentley, Songtian Li, Keisuke Masuda, Yoshio Miura, Ye Du, Takaya Mitsui, Kosuke Fujiwara, Yasuhiro Kobayashi, Tengyu Guo, Guoqiang Yu, Chihiro Suzuki, Shunya Yamamoto, Fu Zheng, Yuya Sakuraba, Seiji Sakai
Summary: This study developed ferrimagnetic cubic Heusler compound Mn(2)FexGa (MFG) thin films with large perpendicular magnetic anisotropy (PMA). By growing MFG on a Cr buffer layer, large PMA exceeding 0.75 MJ m(-3) was obtained in stoichiometric Mn2FeGa (x = 1). First-principles calculations demonstrated that Fe's characteristic electronic structure in the X-a-ordered cubic MFG causes a large uniaxial magnetocrystalline anisotropy under the tetragonal strain consistent with experiment. Cubic Mn2FeGa with its small saturation magnetization, large PMA, and possibility of being highly spin polarized is an ideal candidate for spintronic device development.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rui Wang, Xiao Tian, Zhanquan Yao, Mengran Kong, Yu Wang
Summary: Doping of trace rare-earth element Dy significantly enhances the magnetostrictive properties of Fe81Al19 alloy, leading to a notable increase in the maximum magnetostriction coefficient of the alloy. The enhancement of magnetostriction is mainly attributed to the fact that Dy doping promotes preferred orientation of the alloy along the <100> crystal direction.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Review
Physics, Applied
Libor Vojacek, Fatima Ibrahim, Ali Hallal, Bernard Dieny, Mairbek Chshiev
Summary: The study proposes an alternative design of magnetic tunnel junctions with greatly enhanced perpendicular magnetic anisotropy based on density-functional-theory calculations, utilizing interfacial perpendicular anisotropy and strain-induced bulk PMA in bcc Co. Fe(3ML)Co(4ML)Fe(3ML) is suggested as a storage layer design for MgO-based STT MRAM cells.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Juba Bouaziz, Christopher E. Patrick, Julie B. Staunton
Summary: Using finite temperature first-principles calculations, this study focuses on the important role played by Fe atoms in maintaining the magnetic order and generating significant uniaxial anisotropy in Nd2Fe14B. The strongest coupling between Nd and Fe spins is found on sites belonging to two specific Fe sublattices: 8 j1 and 8 j2. Furthermore, the Fe 8 j1 sublattice explains the unusual, nonmonotonic temperature dependence of the anisotropy in Y2Fe14B. This work provides atomic-level resolution of the properties of this fascinating magnetic material.
Article
Chemistry, Physical
Jeotikanta Mohapatra, Xubo Liu, Pramanand Joshi, J. Ping Liu
Summary: Iron (Fe) is an important ferromagnetic element with high magnetic moment and Curie temperature, and it is widely used in technologies and industries. While Fe-based materials are mostly used as soft magnetic materials due to low magneto-crystalline anisotropy (MCA), recent research has shown promising evidence for achieving high MCA in Fe-based hard magnetic materials without rare-earth elements. This paper reviews the history and recent developments of Fe-based hard and semi-hard magnetic materials, focusing on the mechanisms of high MCA and the related crystal and electronic structures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Alexander B. Shick, Itzhak Halevy, Maxim Tchaplianka, Dominik Legut
Summary: In this study, the electronic structure, spin and orbital magnetic moments, and the magnetic anisotropy energy in selected U-based compounds were investigated. The results showed that the LSDA+U approach provided a good quantitative description for UGa2 and suggested a possible route for the development of rare-earth-lean permanent magnets.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Anupam K. Singh, Parul Devi, Nisha Shahi, K. K. Dubey, Sanjay Singh, Dhananjai Pandey
Summary: This study presents the first comprehensive investigation of the order of phase transitions and its field dependence, as well as magnetoelastic coupling, in the hexagonal compound MnNiGa. The results show that the external magnetic field intensity and magnetoelastic coupling play key roles in the stability of skyrmionic textures in MnNiGa. The findings provide important insights for understanding the extreme sensitivity of magnetic skyrmionic textures to external stresses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
G. Y. Qiao, W. Y. Yang, Y. F. Lai, G. Tian, L. Zha, Q. W. Hu, S. Q. Liu, C. S. Wang, J. Z. Han, H. L. Du, Y. C. Yang, J. B. Yang
MATERIALS RESEARCH EXPRESS
(2019)
Article
Engineering, Electrical & Electronic
G. Y. Qiao, W. Y. Yang, Y. F. Lai, Y. F. Zhang, Q. W. Hu, G. Tian, L. Zha, S. Q. Liu, C. S. Wang, J. Z. Han, H. L. Du, Y. C. Yang, J. B. Yang
IEEE TRANSACTIONS ON MAGNETICS
(2019)
Article
Engineering, Electrical & Electronic
Yuankang Wang, Zhongchong Lin, Zhou Liu, Guanyi Qiao, Pengyu Zhang, Kewei Li, Wenyun Yang, Jingzhi Han, Shunquan Liu, Changsheng Wang, Liang Qiao, Jinbo Yang
Summary: Fe16N2 nanoparticles were synthesized from Fe nanoparticles through hydrogen reduction and ammonia nitriding process. The prepared nanoparticles were mainly composed of Fe16N2 and alpha-Fe. The Fe16N2/paraffin composite exhibited promising microwave absorption properties.
IEEE TRANSACTIONS ON MAGNETICS
(2022)