Observation of two-channel anomalous Hall effect in perpendicularly magnetized NiCo2O4 epitaxial films

被引：1
|
作者：
Zhou, Guowei [1 ,2 ,3 ]
Kang, Penghua [1 ]
Ji, Huihui [1 ]
Dou, Jiarui [1 ]
Wang, Siqi [1 ]
Xu, Xiaohong [1 ,2 ,3 ]
机构：
[1] Shanxi Normal Univ, Sch Chem & Mat Sci, Key Lab Magnet Mol & Magnet Informat Mat, Minist Educ, Taiyuan 030006, Peoples R China
[2] Shanxi Normal Univ, Res Inst Mat Sci, Taiyuan 030006, Peoples R China
[3] Collaborat Innovat Ctr Shanxi Adv Permanent Magnet, Taiyuan 030006, Peoples R China
来源：
PHYSICAL REVIEW B | 2023年 / 108卷 / 09期
基金：
中国国家自然科学基金;
关键词：
METALLIC BEHAVIOR; SPINEL FILMS; THIN-FILMS; SKYRMIONS;
D O I：
10.1103/PhysRevB.108.094442
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The anomalous Hall effect (AHE) is essential for developing highly tunable spintronic devices. An interesting phenomenon with AHE is the appearance of an additional hump on the respective magnetic films. However, it is still being disputed whether it originates from an intrinsic mechanism of the Berry phase accumulation in real space or is artificially generated by inhomogeneities. This work systematically investigates the magnetism, electronic transport, and Hall effect of NiCo2O4 (NCO) films with different thicknesses. The investigation reveals that the strong perpendicular magnetic anisotropy, metallic transport, and AHE are coexisting in NCO films. Especially, the sharp spikes in anomalous Hall effect are observed in thinner NCO films. The two-channel AHE model is used to explain the origin of the sharp spikes associated with anomalous Hall effect. It indicates that the phase separation is the reason for the sharp spikes. In addition, the mixed valence state, ferrimagnetic order, and the electronic configuration in NCO films are further analyzed. This study is essential for a comprehensive understanding of NCO films.
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页数：9
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