论文标题
Ni（111）薄膜中的立方磁光kerr效果
Cubic magneto-optic Kerr effect in Ni(111) thin films with and without twinning
论文作者
论文摘要
在大多数利用磁化kerr效应（MOKE）的研究中，磁化样品反射后检测到的偏振光变化应与磁化$ \ boldsymbol {m} $成比例。但是，也已经确定和利用了$ \ boldsymbol {m} $中的moke签名，例如，以感知赫斯勒化合物中的结构顺序，以检测旋转轨道扭矩或图像抗fiferromagnetic域。在我们的研究中，我们观察到ni（111）薄膜中三阶的三阶各向异性moke的贡献，归因于立方磁磁张量张力$ \ propto $ $ $ $ $ \ boldsymbol {m} m}^3 $。我们进一步表明，立方摩克（CMOKE）的角度依赖性受样品中结构域孪生量的影响。我们对两个选定光子能量的CMOKE的详细研究将为CMOKE应用开辟新的机会，对薄膜的孪生特性敏感，例如CMOKE光谱和显微镜或时间分辨CMOKE。
In most studies utilizing the magneto-optic Kerr effect (MOKE), the detected change of polarized light upon reflection from a magnetized sample is supposed to be proportional to the magnetization $\boldsymbol{M}$. However, MOKE signatures quadratic in $\boldsymbol{M}$ have also been identified and utilized, e.g., to sense the structural order in Heusler compounds, to detect spin-orbit torques or to image antiferromagnetic domains. In our study, we observe a strong anisotropic MOKE contribution of third order in $\boldsymbol{M}$ in Ni(111) thin films, attributed to a cubic magneto-optic tensor $\propto $ $\boldsymbol{M}^3$. We further show that the angular dependence of cubic MOKE (CMOKE) is affected by the amount of structural domain twinning in the sample. Our detailed study on CMOKE for two selected photon energies will open up new opportunities for CMOKE applications with sensitivity to twinning properties of thin films, e.g. CMOKE spectroscopy and microscopy or time-resolved CMOKE.
