Non-local magnetoresistance in YIG/Pt nanostructures
Non-local magnetoresistance in YIG/Pt nanostructures
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DOI：
10.1063/1.4935074
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发表时间：
2015-10-26
影响因子：
4
通讯作者：
Huebl, Hans
中科院分区：
文献类型：
--
作者：
Goennenwein, Sebastian T. B.;Schlitz, Richard;Huebl, Hans
我们研究了沉积在钇铁石榴石上的薄铂带的局域和非局域磁电阻。局部磁阻响应，推断从电压降测量沿着一个给定的Pt条电流偏置时，显示的自旋霍尔磁阻的特征磁化取向依赖。我们同时还记录了沿着第二个电隔离的Pt条出现的非局部电压，该Pt条与载流的Pt条隔开几百nm的间隙。相应的非局域磁阻表现出预期的磁振子自旋累积驱动过程的对称性，证实了Cornelissen等人最近提出的结果[“Long-distance transport of magnon spin information in a magnetic insulator at room temperature，”Nat. Phys.（2015年9月14日在线发表）]。我们的磁输运数据，采取在一系列不同的温度作为磁场方向的函数，在三个相互正交的平面旋转的外部施加的字段，表明背后的自旋霍尔和非本地磁阻的机制是质的不同。特别是，非本地磁阻消失在液氦温度，而自旋霍尔磁阻占上风。(C)2015 AIP Publishing LLC.
We study the local and non-local magnetoresistance of thin Pt strips deposited onto yttrium iron garnet. The local magnetoresistive response, inferred from the voltage drop measured along one given Pt strip upon current-biasing it, shows the characteristic magnetization orientation dependence of the spin Hall magnetoresistance. We simultaneously also record the non-local voltage appearing along a second, electrically isolated, Pt strip, separated from the current carrying one by a gap of a few 100 nm. The corresponding non-local magnetoresistance exhibits the symmetry expected for a magnon spin accumulation-driven process, confirming the results recently put forward by Cornelissen et al. ["Long-distance transport of magnon spin information in a magnetic insulator at room temperature," Nat. Phys. (published online 14 September 2015)]. Our magnetotransport data, taken at a series of different temperatures as a function of magnetic field orientation, rotating the externally applied field in three mutually orthogonal planes, show that the mechanisms behind the spin Hall and the non-local magnetoresistance are qualitatively different. In particular, the non-local magnetoresistance vanishes at liquid Helium temperatures, while the spin Hall magnetoresistance prevails. (C) 2015 AIP Publishing LLC.