Damping in Yttrium Iron Garnet Nanoscale Films Capped by Platinum
Damping in Yttrium Iron Garnet Nanoscale Films Capped by Platinum
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DOI：
10.1103/physrevlett.111.106601
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发表时间：
2013-09-06
影响因子：
8.6
通讯作者：
Hoffmann, Axel
中科院分区：
文献类型：
--
作者：
Sun, Yiyan;Chang, Houchen;Hoffmann, Axel
在纳米厚的钇铁石榴石（YIG）薄膜由于Pt覆盖层的强阻尼增强观察。这种阻尼是基本上大于预期的阻尼，由于传统的自旋泵，是伴随着在铁磁共振场的移位，并可以抑制通过使用之间的YIG和Pt膜的Cu间隔。结果表明，这种阻尼效应可能源于YIG/Pt界面附近Pt原子层的铁磁有序化以及有序Pt自旋与YIG薄膜自旋之间的动态交换耦合。
Strong damping enhancement in nm-thick yttrium iron garnet (YIG) films due to Pt capping layers was observed. This damping is substantially larger than the expected damping due to conventional spin pumping, is accompanied by a shift in the ferromagnetic resonance field, and can be suppressed by the use of a Cu spacer in between the YIG and Pt films. The data indicate that such damping may originate from the ferromagnetic ordering in Pt atomic layers near the YIG/Pt interface and the dynamic exchange coupling between the ordered Pt spins and the spins in the YIG film.