论文标题
顺磁性ndgao3中的自旋霍尔磁力
Spin Hall magnetoresistance in paramagnetic NdGaO3
论文作者
论文摘要
近年来,旋转霍尔磁场(SMR)已成为通过电流以有序的磁系统探测自发磁化态的有效方法。鲜为人知的是它作为不具有自发磁化(例如Paramagnets)的材料的探针。在这项工作中,SMR用于探测一种具有相当大的旋转轨道相互作用(L = 6)的稀土氧化物(NGO),这是一种稀土氧化物。非政府组织尚未因其在传播旋转方面的效率而受到调查。我们使用铂(PT)作为自旋注射器和检测器进行了广泛的温度和依赖性磁阻(ADMR)研究,并利用(逆)自旋霍尔效应。我们发现,在非政府组织中,ADR响应与磁化的温度依赖性与ADRR振幅的线性电流偏置依赖性之间存在密切的相关性。这些是pt/ngo中SMR效应的童经性,是由作用于非政府组织的局部力矩的扭矩引起的,并考虑了晶体场诱导的跨跨ipliplet跃迁。为了验证PT/NGO双层中观察到的SMR响应,还进行了PT/SRTIO3和PT/SIO2设备上的对照实验,并排除PT的磁性贡献。
In recent years, spin Hall magnetoresistance (SMR) has emerged as an efficient way to probe the spontaneous magnetization state in ordered magnetic systems, by electrical current. Less known is its versatility as a probe of materials that do not possess spontaneous magnetization such as in paramagnets. In this work, SMR is used to probe paramagnetic NdGaO3 (NGO), a rare earth oxide, possessing a sizable spin orbit interaction (L=6). NGO has not been investigated earlier for its efficiency in propagating spins. We have performed extensive temperature and angle dependent-magnetoresistance (ADMR) studies along dissimilar crystallographic axes in NGO, using platinum (Pt) as spin injector and detector and utilizing (inverse) spin Hall effect. We find a close correlation between the temperature dependence of the ADMR response with magnetization in NGO and a linear current bias dependence of the ADMR amplitudes. These are chacteristics of SMR effect in Pt/NGO, arising from the torque acting on localized moments in NGO and considering crystal field induced intermultiplet transitions with temperature. Control experiments on Pt/SrTiO3 and Pt/SiO2 devices were also carried out in order to validate the observed SMR response in Pt/NGO bilayer and to rule out magnetoresistive contributions from Pt.