Theoretical Study of Gilbert Damping in Rare-Earth Permanent Magnets
Theoretical Study of Gilbert Damping in Rare-Earth Permanent Magnets
复制标题
稀土永磁体吉尔伯特阻尼的理论研究
DOI：
10.1109/tmag.2019.2892493
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
and Akimasa Sakuma
中科院分区：
文献类型：
--
作者：
Fumiya Saito;Daisuke Miura;and Akimasa Sakuma
我们研究了稀土永磁体R2Fe14B （R是稀土元素）中铁亚晶格磁化的吉尔伯特阻尼的温度依赖性。假设Fe的自旋角矩通过局域4f电子系统耗散到声子系统中，并与声子系统相互作用，我们基于配体场理论得到了Gilbert阻尼常数α的表达式，并评价了α对温度和物质的依赖关系。我们发现，由于4f电子系统的离散能量结构，磁化的吉尔伯特阻尼仅在某些温度区域出现。
We investigate temperature dependence of the Gilbert damping of a magnetization of the Fe sublattice in rare-earth permanent magnets R2Fe14B (R is a rare-earth element). Assuming that the spin angular moment of Fe dissipates to the phonon system via a localized 4f electron system, which interacts with the phonon system, we obtain the formulation of the Gilbert damping constant α on the basis of the ligand field theory and evaluate the temperature and material dependence of α. We show that the Gilbert damping of the magnetization arises only in certain temperature regions due to the discrete energy structure of the 4f electron system.