Optical detection of transverse spin-Seebeck effect in permalloy film using Sagnac interferometer microscopy
Optical detection of transverse spin-Seebeck effect in permalloy film using Sagnac interferometer microscopy
复制标题
使用萨格纳克干涉仪显微镜光学检测坡莫合金薄膜中的横向自旋塞贝克效应
DOI：
10.1103/physrevb.95.180401
复制
发表时间：
2017
影响因子：
3.7
通讯作者：
Z. Vardeny
中科院分区：
文献类型：
--
作者：
R. McLaughlin;Dali Sun;Chuang Zhang;M. Groesbeck;Z. Vardeny
在这里，作者调查的可能性，建立非平衡自旋积累的铁磁薄膜组成的金属合金的镍和铁，通常被称为坡莫合金。类似于热电发电机，已知铁磁体中的温度梯度在宏观距离上产生累积电子自旋的分布，这可以在未来的自旋电子器件中用作自旋极化电子的有效来源。为了能够检测和定量确定这种电子自旋的不平衡，作者开发了一种完全光学的技术，基于磁光克尔效应，使用Sagnac干涉仪显微镜，空间分辨率为1微米，绝对偏振角分辨率为10纳米弧度。这种新技术不仅对电伪影具有鲁棒性，而且允许用户测量以前无法获得的实验几何形状，其中磁化不限于位于膜的平面内。
Here, the authors investigate the possibility of building up nonequilibrium spin accumulation in a ferromagnetic thin film composed of a metallic alloy of nickel and iron, commonly known as permalloy. Analogously to thermoelectric generators, a temperature gradient in a ferromagnet is known to generate a distribution of accumulated electron spins over macroscopic distances, which may be used as an efficient source of spin-polarized electrons in future spintronic devices. To enable the detection and quantitative determination of this imbalance of electron spins, the authors have developed an entirely optical technique, based on the magneto-optical Kerr effect, using a Sagnac interferometer microscope with a spatial resolution of one micrometer and an absolute polarization angle resolution of ten nanoradians. This new technique is not only robust against electrical artifacts, but allows the user to measure previously inaccessible experimental geometries where the magnetization is not restricted to lying in the plane of the film.