Competing effects at Pt/YIG interfaces: Spin Hall magnetoresistance, magnon excitations, and magnetic frustration
Competing effects at Pt/YIG interfaces: Spin Hall magnetoresistance, magnon excitations, and magnetic frustration
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DOI：
10.1103/physrevb.94.174405
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发表时间：
2016-06
影响因子：
3.7
通讯作者：
S. V'elez;A. Bedoya-Pinto;Wenjing Yan;L. Hueso;F. Casanova
中科院分区：
文献类型：
--
作者：
S. V'elez;A. Bedoya-Pinto;Wenjing Yan;L. Hueso;F. Casanova
研究了$\ mathm {Pt}/{\ mathm {Y}}_{3}\ mathm {F}{\ mathm {e}}_{5}{\ mathm {O}}_{12}(\ mathm {YIG})$基器件的自旋霍尔磁电阻（SMR）和磁振子自旋输运（MST）。我们的测量结果表明，对YIG薄膜进行表面处理后，其自旋混合电导率略有提高，室温下自旋-磁振子转换效率显著提高。YIG薄膜表面在低温下产生表面磁挫折，导致SMR的符号变化和MST的显著抑制。我们的研究结果证明SMR和MST可以用于探索表面的磁性，包括那些具有复杂磁性织构的表面，并强调了非磁性/铁磁性界面性质在所得自旋电子器件性能中的关键重要性。
We study spin Hall magnetoresistance (SMR) and magnon spin transport (MST) in $\mathrm{Pt}/{\mathrm{Y}}_{3}\mathrm{F}{\mathrm{e}}_{5}{\mathrm{O}}_{12}(\mathrm{YIG})$-based devices with intentionally modified interfaces. Our measurements show that the surface treatment of the YIG film results in a slight enhancement of the spin-mixing conductance and an extraordinary increase in the efficiency of the spin-to-magnon conversion at room temperature. The surface of the YIG film develops a surface magnetic frustration at low temperatures, causing a sign change of the SMR and a dramatic suppression of the MST. Our results evidence that SMR and MST could be used to explore magnetic properties of surfaces, including those with complex magnetic textures, and stress the critical importance of the nonmagnetic/ferromagnetic interface properties in the performance of the resulting spintronic devices.