Investigation of the magnetic properties of insulating thin films using the longitudinal spin Seebeck effect
Investigation of the magnetic properties of insulating thin films using the longitudinal spin Seebeck effect
复制标题
DOI：
10.1063/1.4864252
复制
发表时间：
2014-03
影响因子：
3.2
通讯作者：
A. Kehlberger;G. Jakob;M. Onbaşlı;Dong-Hun Kim;C. Ross;M. Kläui
中科院分区：
文献类型：
--
作者：
A. Kehlberger;G. Jakob;M. Onbaşlı;Dong-Hun Kim;C. Ross;M. Kläui
利用纵向自旋塞贝克效应检测磁性绝缘薄膜的磁性和开关特性。采用脉冲激光沉积法制备300 nm和20 nm厚的钇铁石榴石（YIG, Y3Fe5O12）薄膜，再涂覆铂，利用逆自旋霍尔效应检测热激磁振子。逆自旋霍尔信号揭示了沿较厚薄膜中铂条纹方向的磁单轴各向异性。对于薄膜，我们发现了一种更各向同性的行为，这是通过在铂/YIG界面上发生的磁电阻互补观察到的。我们在x射线衍射数据的基础上解释了我们的结果，这些数据揭示了衬底和薄膜表面的切割错误以及YIG晶格的扩展。这两个发现都支持我们观察到的生长诱导的磁各向异性。
The longitudinal spin Seebeck effect is used as a detector for the magnetic properties and switching characteristics of magnetic thin insulating films. We use a 300 nm and a 20 nm thick Yttrium Iron Garnet (YIG, Y3Fe5O12) film prepared by pulsed laser deposition and afterwards coated by platinum for the detection of the thermally excited magnons by the inverse spin Hall effect. The inverse spin Hall signals reveal a magnetic uniaxial anisotropy along the direction of the platinum stripe in the thicker film. For the thin film we find a more isotropic behavior, which is complementarily observed using the magnetoresistance occurring at the platinum/YIG interface. We explain our results on the basis of x-ray diffraction data, which reveal a miscut of the substrate and film surface and an expansion of the YIG lattice. Both findings favor a growth-induced magnetic anisotropy that we observe.