Magnon Mode Selective Spin Transport in Compensated Ferrimagnets
Magnon Mode Selective Spin Transport in Compensated Ferrimagnets
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DOI：
10.1021/acs.nanolett.6b04522
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发表时间：
2017-06-01
期刊：
影响因子：
10.8
通讯作者：
Goennenwein, Sebastian T. B.
中科院分区：
文献类型：
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作者：
Cramer, Joel;Guo, Er-Jia;Goennenwein, Sebastian T. B.
我们研究了角波热自旋电流的产生及其在绝缘、补偿亚铁磁体/普通金属双层系统中跨界面的模式选择性自旋传输。自旋塞贝克效应信号表现出非单调温度依赖性，检测到的电压信号有两个符号变化。使用不同的亚铁磁性石榴石，我们证明了所观察到的自旋塞贝克效应的复杂温度依赖性的普遍性。为了了解其起源，我们系统地改变了亚铁磁性石榴石和金属层之间的界面，并通过使用不同的金属层，我们确定界面效应起着主导作用。它们不仅改变自旋塞贝克效应信号的幅度，而且特别改变其温度依赖性。通过改变温度，我们可以选择主要的磁振子模式，并分析结果以揭示不同磁振子模式和界面的模式选择性界面传输概率。所选系统的比较揭示了取决于所涉及材料的界面耦合的半定量细节，并得到了所获得的信号场依赖性的支持。
We investigate the generation of magnonic thermal spin currents and their mode selective spin transport across interfaces in insulating, compensated ferrimagnet/normal metal bilayer systems. The spin Seebeck effect signal exhibits a nonmonotonic temperature dependence with two sign changes of the detected voltage signals. Using different ferrimagnetic garnets, we demonstrate the universality of the observed complex temperature dependence of the spin Seebeck effect. To understand its origin, we systematically vary the interface between the ferrimagnetic garnet and the metallic layer, and by using different metal layers we establish that interface effects play a dominating role. They do not only modify the magnitude of the spin Seebeck effect signal but in particular also alter its temperature dependence. By varying the temperature, we can select the dominating magnon mode and we analyze our results to reveal the mode selective interface transmission probabilities for different magnon modes and interfaces. The comparison of selected systems reveals semiquantitative details of the interfacial coupling depending on the materials involved, supported by the obtained field dependence of the signal.