Tuning the magnetocrystalline anisotropy of rare-earth free L10-ordered Mn1-xTMxAl magnetic alloy (TM = Fe, Co, or Ni) with transition elements
- Authors
- Choi, Minyeong; Hong, Yang-Ki; Won, Hoyun; Yeo, Chang-Dong; Shah, Nayem M. R.; Choi, Byoung-Chul; Lee, Woncheol; Choi-Yim, Haein; Lee, Wooyoung; Thiele, Jan-Ulrich
- Issue Date
- Jan-2024
- Publisher
- Elsevier BV
- Keywords
- First-principles calculations; Hard magnetic material; Magnetic properties; Rare-earth free L10-ordered magnetic alloy
- Citation
- Journal of Magnetism and Magnetic Materials, v.589
- Journal Title
- Journal of Magnetism and Magnetic Materials
- Volume
- 589
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159874
- DOI
- 10.1016/j.jmmm.2023.171513
- ISSN
- 0304-8853
1873-4766
- Abstract
- Tuning of the magnetocrystalline anisotropy of MnAl was studied by substituting Mn of MnAl with transition elements (Fe, Co, or Ni). The Brillouin function and semi-empirical Callen and Callen relation predicted the thermal behaviors of saturation magnetization and magnetocrystalline anisotropy energy. First-principles calculations based on density functional theory (DFT) were performed to calculate the electronic structures of Mn0.5TM0.5Al, where TM = Mn, Fe, Co, and Ni. The estimated total magnetic moment of Mn0.5TM0.5Al decreases as the number of valence electrons (n) of TM (e.g., 7 for Mn (3d5 4 s2), 8 for Fe (3d6 4 s2), 9 for Co (3d7 4 s2), and 10 for Ni (3d8 4 s2)) increases. Ni-substituted MnAl becomes ferrimagnetic, while other TM-substituted MnAl retain a ferromagnetic state. Curie temperature rapidly decreases with increasing the valence electrons from 685 K for MnAl to 20 K for Ni-substituted MnAl. Thermomagnetic behaviors of Mn0.5TM0.5Al (TM = Mn, Fe, Co, or Ni) are reported. Our magnetocrystalline anisotropy energy (MAE) calculations demonstrate that the magneto crystalline anisotropy changes to the in-plane from the out-of-plane (uniaxial) direction for Co- and Nisubstituted MnAl. The K reaches a maximum of 2.98 MJ/m3 at n = 8, i.e., Fe substitution.
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