标题： 通过各向异性磁阻研究外延 Fe$_{85}$Co$_{15}$薄膜的磁化过程 显示英文标题

标题： Magnetization process in epitaxial Fe$_{85}$Co$_{15}$ thin films via anisotropic magnetoresistance

摘要： 近年来，由于各向异性磁阻在磁化动力学电检测中的作用，铁磁合金中晶体对磁输运特性的影响正在被重新审视，这与估算自旋输运参数（如自旋霍尔角或阻尼常数）有关。 在本工作中，我们研究了外延Fe85Co15薄膜中的晶体依赖性各向异性磁阻，并通过改变电流方向、外部磁场方向和Fe85Co15晶体学方向之间的相对取向，讨论了磁化过程通过磁输运特性。 我们发现，各向异性磁阻比取决于电流方向相对于Fe85Co15晶体轴的方向，并且当电流沿[110]硬轴和[100]易轴分别施加时，测得的比值分别为0.20%和0.17%。 我们使用Stoner-Wohlfarth模型拟合实验数据，以描述磁化过程中磁化方向的变化路径，并提取各向异性常数。 拟合得到的立方各向异性和单轴各向异性常数分别为Kc = 21 kJ/m3和Ku = 11 kJ/m3，这些值与铁磁共振角度变化实验中报道的数值相当。 我们的结果有助于理解FeCo合金中晶体结构与磁输运特性之间的相互作用。 显示英文摘要

摘要： The effects of the crystalline symmetry on the magnetotransport properties in ferromagnetic alloys are being reexamined in recent years particularly due to the role of the anisotropic magnetoresistance on the electrical detection of magnetization dynamics, which is relevant to estimate spin transport parameters such as the spin Hall angle or the damping constant. In this work we investigated the crystalline dependent anisotropic magnetoresistance in epitaxial Fe85Co15 films and discuss the magnetization process through the magnetotransport properties by varying the relative orientations between the electric current, the external magnetic field and the Fe85Co15 crystallographic directions. We have found that the anisotropic magnetoresistance ratio depends on the current direction with respect to the crystal axes of Fe85Co15 and determine a ratio of 0.20 % and 0.17 % when the current is applied along the [110] hard and [100] easy axes, respectively. We fit our experimental data using the Stoner-Wohlfarth model to describe the path followed by the magnetization during the magnetization process and to extract the anisotropy constants. The fitted cubic and uniaxial anisotropy constants are Kc = 21 kJ/m3 and Ku = 11 kJ/m3, which are comparable with reported values from the angular variation of ferromagnetic resonance experiments. Our results contribute to the understanding of the interplay between the crystalline structure and the magnetotransport properties of FeCo alloys.