Thickness-and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films
Thickness-and temperature-dependent magnetodynamic properties of yttrium iron garnet thin films
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DOI：
10.1063/1.4914363
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发表时间：
2015-05-07
影响因子：
3.2
通讯作者：
Akerman, J.
中科院分区：
文献类型：
--
作者：
Haidar, M.;Ranjbar, M.;Akerman, J.
采用铁磁共振方法研究了纳米钇铁石榴石薄膜的磁动力学性质。薄膜是用脉冲激光沉积法在钆镓石榴石衬底上生长的。首先，我们发现，阻尼系数随着温度的增加而增加，对于不同的膜厚度。第二，我们发现了两种不同的依赖性的阻尼膜厚度：在室温下，阻尼系数增加的膜厚度的减少，而在T = 8K，我们发现阻尼依赖于只有微弱的厚度。我们将这种行为归因于表面杂质或缺陷对磁化弛豫的增强。(c)2015 AIP Publishing LLC.
The magnetodynamical properties of nanometer-thick yttrium iron garnet films are studied using ferromagnetic resonance as a function of temperature. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition. First, we found that the damping coefficient increases as the temperature increases for different film thicknesses. Second, we found two different dependencies of the damping on film thickness: at room temperature, the damping coefficient increases as the film thickness decreases, while at T = 8K, we find the damping to depend only weakly on the thickness. We attribute this behavior to an enhancement of the relaxation of the magnetization by impurities or defects at the surfaces. (c) 2015 AIP Publishing LLC.