Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states
Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states
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DOI：
10.1063/1.3067607
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发表时间：
2009-04-01
影响因子：
3.2
通讯作者：
Miyazaki, T.
中科院分区：
文献类型：
--
作者：
Mizukami, S.;Watanabe, D.;Miyazaki, T.
研究了Co2 FeAl Heusler合金薄膜的吉尔伯特阻尼特性。通过分析在2-20 GHz频率下测量的铁磁共振数据，评估了薄膜的吉尔伯特阻尼常数。退火前薄膜的吉尔伯特阻尼常数较大，退火后薄膜的阻尼常数显著降低。在600 ℃退火的膜的吉尔伯特阻尼常数接近或等于0.001。吉尔伯特阻尼常数的这些行为可以很好地解释的事实，即从第一性原理计算的态密度随B2阶的增加而减少。(c)2009年美国物理学会。[DOI 10.1063/1.3067607]
Gilbert damping for the epitaxial Co2FeAl Heusler alloy films was investigated. Gilbert damping constant for the films was evaluated by analyzing the data of ferromagnetic resonance measured at the frequency of 2-20 GHz. Gilbert damping constant for the film without annealing was rather large, while it decreased remarkably with postannealing. Gilbert damping constant for the film annealed at 600 degrees C was similar or equal to 0.001. These behavior of Gilbert damping constant can be well explained by the fact that the density of states calculated from first principles decreases with increasing the degree of B2 order. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.3067607]