Spin Pumping without Three-Magnon Splitting in Polycrystalline Bi1Y2Fe5O12/Pt Bilayer Structure
Spin Pumping without Three-Magnon Splitting in Polycrystalline Bi1Y2Fe5O12/Pt Bilayer Structure
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DOI：
10.1143/jjap.51.103004
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发表时间：
2012-10-01
影响因子：
1.5
通讯作者：
Sato, Tetsuya
中科院分区：
文献类型：
--
作者：
Iguchi, Ryo;Ando, Kazuya;Sato, Tetsuya
利用逆自旋霍尔效应（ISHE）研究了多晶Bi取代的钇铁石榴石（Bi：YIG）/Pt双层结构在不同旋进频率下的自旋抽运，并与单晶La取代的钇铁石榴石（La：YIG）/Pt双层结构的三磁振子分裂进行了比较.随着旋进频率降低，多晶样品中的泵浦自旋电流的幅度连续增加到与单晶样品中的最高幅度相当的高幅度，而单晶样品中的泵浦自旋电流的幅度降低到低于三磁振子分裂的阈值频率。通过比较多晶样品的ISHE电压和微波吸收强度，我们证实了通过抑制三磁振子分裂，在低频率下维持了大幅度的泵浦自旋电流。(C)2012日本应用物理学会
Spin pumping at various precession frequencies has been investigated in a polycrystalline Bi-substituted yttrium iron garnet (Bi:YIG)/Pt bilayer structure by means of inverse spin Hall effect (ISHE) with comparison to a single crystal La-substituted yttrium iron garnet (La:YIG)/Pt bilayer structure which shows three-magnon splitting. As precession frequency decreases, the magnitude of pumped spin currents in the polycrystalline sample continuously increases to high magnitude comparable to the highest magnitude in the single crystal sample while that in the single crystal sample decreases below a threshold frequency of three-magnon splitting. By comparing ISHE voltage with microwave absorption intensity in the polycrystalline sample, we verify that the large magnitude of the pumped spin currents is maintained at low frequencies through the suppression of three-magnon splitting. (C) 2012 The Japan Society of Applied Physics