Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys
Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys
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DOI：
10.1103/physrevlett.122.127203
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发表时间：
2019-03-28
影响因子：
8.6
通讯作者：
Ono, Teruo
中科院分区：
文献类型：
--
作者：
Kim, Duck-Ho;Okuno, Takaya;Ono, Teruo
研究了稀土(RE)-过渡金属（TM）铁磁体在较宽温度范围内的Gilbert阻尼参数α。从磁场驱动的磁畴壁迁移率中提取，α低至10（-3）的数量级，并且在角动量补偿温度T-A中几乎是恒定的，这与先前的预测形成鲜明对比，即由于总角动量消失，α（）应该在T-A发散。因此，RE-TM铁磁体的磁阻尼与总角动量无关，而是由费米能级上的电子散射决定，其中TM具有主要的阻尼作用。吉尔伯特阻尼参数的低值表明，铁磁体可以作为低耗散高速磁性器件的通用平台。
We investigate the Gilbert damping parameter alpha for rare earth (RE)-transition metal (TM) ferrimagnets over a wide temperature range. Extracted from the field-driven magnetic domain-wall mobility, alpha was as low as the order of 10(-3) and was almost constant across the angular momentum compensation temperature T-A, starkly contrasting previous predictions that alpha( )should diverge at T-A due to a vanishing total angular momentum. Thus, magnetic damping of RE-TM ferrimagnets is not related to the total angular momentum but is dominated by electron scattering at the Fermi level where the TM has a dominant damping role. This low value of the Gilbert damping parameter suggests that ferrimagnets can serve as versatile platforms for low-dissipation high-speed magnetic devices.