Dzyaloshinskii-Moriya interactions in Nd2Fe14B as the origin of spin reorientation and the rotating magnetocaloric effect
Dzyaloshinskii-Moriya interactions in Nd2Fe14B as the origin of spin reorientation and the rotating magnetocaloric effect
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Nd2Fe14B 中的 Dzyaloshinskii-Moriya 相互作用作为自旋重新定向和旋转磁热效应的起源
DOI：
10.1016/j.apmt.2023.101825
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发表时间：
2023
影响因子：
8.3
通讯作者：
Matsushita Yu-ichiro
中科院分区：
文献类型：
--
作者：
Tran Hung Ba;Matsushita Yu-ichiro
本文采用第一性原理计算和Monte Carlo模拟相结合的方法，对钕永磁体的主晶Nd 2Fe 14 B的自旋重取向机制进行了研究。自旋重取向被认为是源于晶体场效应，并没有得到研究人员的显着关注，因为它是一个不可取的性质，在硬磁体的应用。类似地，在稀土块体系统（包括永磁体如Nd 2Fe 14 B）中，Dzyaloshinskii-Moriya相互作用通常被忽略，因为人们认为磁各向异性比Dzyaloshinski-Moriya相互作用更占主导地位。然而，在这项研究中，我们第一次发现，在Nd_2Fe_（14）B中的自旋重取向是由Dzyaloshinskiii-Moriya相互作用引起的。此外，我们还发现Nd_2Fe_（14）B中的自旋重取向导致了旋转磁热效应，这可能具有实际应用价值。我们还发现，Dzyaloshinskiii-Moriya相互作用不可忽视地影响磁性材料的物理性质。
In this study, the mechanism of spin reorientation in Nd2Fe14B, which is the host crystal of prevalently employed neodymium permanent magnets, was investigated by combining first–principles calculations and Monte Carlo simulations. Spin reorientation is thought to originate from crystal field effects and has not received significant attention from researchers because it is an undesirable property in hard magnet applications. Similarly, Dzyaloshinskii–Moriya interactions are often ignored in rare–earth bulk systems, including permanent magnets such as Nd2Fe14B, because it is believed that magnetic anisotropy is more dominant than Dzyaloshinskii–Moriya interactions. However, in this study, for the first time, we found that the spin reorientation in Nd2Fe14B is caused by Dzyaloshinskii–Moriya interactions. Furthermore, we found that the spin reorientation in Nd2Fe14B results in the rotating magnetocaloric effect, which might be used for practical applications. We also found that the Dzyaloshinskii–Moriya interactions non-negligibly affect the physical properties of magnetic materials.