Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping
Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping
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DOI：
10.1063/1.4926599
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发表时间：
2015-07
期刊：
影响因子：
1.6
通讯作者：
A. Baker;A. I. Figueroa;G. Laan;T. Hesjedal
中科院分区：
文献类型：
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作者：
A. Baker;A. I. Figueroa;G. Laan;T. Hesjedal
我们报告通过Dy掺杂外延Fe薄膜的弛豫参数和磁矩的控制修改。铁磁共振测量结果表明，Dy掺杂从0.1%增加到5%，得到了三倍的吉尔伯特阻尼，更重要的是一个强烈增强的各向异性阻尼，可以定性地理解，通过缓慢放松杂质模型。X射线磁性圆二色性测量显示出Dy掺杂对Fe的轨道矩的显著抑制，导致轨道与自旋矩之比ml/ms几乎下降三倍。因此，Dy掺杂可用于控制薄铁磁膜的动态和静态性质，以改善自旋电子器件应用中的性能，通过4F和3D状态的反铁磁相互作用介导。
We report on the controlled modification of relaxation parameters and magnetic moments of epitaxial Fe thin films through Dy doping. Ferromagnetic resonance measurements show that an increase of Dy doping from 0.1% to 5% gives a tripling in Gilbert damping, and more importantly a strongly enhanced anisotropic damping that can be qualitatively understood through the slow-relaxing impurity model. X-ray magnetic circular dichroism measurements show a pronounced suppression of the orbital moment of the Fe with Dy doping, leading to an almost threefold drop in the orbital to spin moment ratio, ml/ms. Doping with Dy can therefore be used to control both dynamic and static properties of thin ferromagnetic films for improved performance in spintronics device applications, mediated through the antiferromagnetic interaction of the 4f and 3d states.