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arXiv 2201.04696cond-mat.mtrl-sci
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Ho/FeCoGd /β-W多层膜的磁输运和磁织构

Magneto-transport and magnetic textures in Ho/FeCoGd/β-W multilayers

Ramesh C. Budhani, Vinay Sharma, Ezana Negusse, Jacob Casey, Arjun K. Pathak, Jerzy T. Sadowski, Brian Kirby

摘要:

在磁性多层膜中,界面间的Dzyaloshinskiii-Moriya相互作用(Dzyaloshinskiii-Moriya Interaction,DzY-Moriya Interaction)的增强导致了手性畴壁和Skyrmion等拓扑自旋织构的稳定。在这里,我们报告的界面驱动的磁相互作用的评估在一个独特设计的多层膜中,每个磁性层的两个AFM耦合的3d和4f时刻的子晶格夹在β-钨和钬的层之间的自旋霍尔角是大的,但相反的符号。这些多层膜的原子和磁周期性的建立极化中子反射率测量和存在的迷宫域自旋织构的零剩磁与X射线光电子显微镜。在较宽的温度(T)和磁场(H)范围内测量了霍尔电阻率(ρ xy}(T,H))和静态磁化强度(M(T,H)),结果表明在T>350 K时,3d和4f亚晶格之间即将发生补偿。这些多层膜的特征是小的(0.04%)但正的磁电阻,表明界面增强散射和大的(40 nΩ.m)和负的反常ρ_{xy}(T,H),这是由于4f矩与外部磁场平行排列而产生的。当温度高于200 K时,ρ_{xy}(T,H),ρ_{xx}(T,H)和M(T,H)之间没有明显的标度关系,此时磁化强度呈现出面外各向异性。在T> 200 K时,ρ_{xy}的场扫描在磁饱和附近出现明显的尖点。在3d和4f磁子晶格的反常Hall双折射率对ρ_{xy}有明显拓扑贡献的模型框架下,对这些Hall数据进行了分析。这一拓扑效应是由界面张力引起的,在3d和4f晶格几乎得到补偿的温度范围内,这种拓扑效应占主导地位。

英文摘要:

The enhancement of interfacial Dzyaloshinskii-Moriya Interaction (DMI) in magnetic multilayers results in the stabilization of topological spin textures like chiral domain walls and skyrmions. Here we report on the evaluation of interface-driven magnetic interactions in a uniquely designed multilayer where each magnetic layer of two AFM coupled sublattices of 3d and 4f moments is sandwiched between the layers of β-tungsten and holmium whose spin Hall angles are large but opposite in sign. The atomic and magnetic periodicity of these multilayers is established by polarized neutron reflectivity measurements and the presence of a labyrinth domain spin texture of zero remanence with x-ray photoelectron microscopy. Measurements of the Hall resistivity (ρ_{xy}(T, H)) together with static magnetization (M(T,H)) over a broad range of temperature (T) and magnetic field (H) indicate impending compensation between 3d and 4f sublattices at T>350 K. These multilayers are characterized by a small (0.04 %) but positive magnetoresistance indicative of interface enhance scattering and a large (40 nΩ.m) and negative anomalous ρ_{xy}(T,H) which results from a parallel alignment of 4f moments with the external magnetic field. No distinct scaling is seen between ρ_{xy}(T,H), ρ_{xx}(T, H) and M(T,H) at temperatures above 200K where the magnetization develops out-of-plane anisotropy. The field scans of ρ_{xy} at T>200K show a distinct cusp in the vicinity of magnetic saturation. These Hall data have been analyzed in the framework of a model where a distinct topological contribution to ρ_{xy} rides over the anomalous Hall resistivities of the 3d and 4f magnetic sublattices. It is suggested that this apparent topological effect results from an interfacial DMI and dominates ρ_{xy}(T,H) in the temperature regime where the 3d and 4f lattices are nearly compensated.

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