Different oxygen migration behaviors at CoFe/MgO and CoFe/HfO2 interfaces and their effects on the magnetic anisotropy
Source abstract
Abstract
We have studied annealing-induced oxygen migration at CoFe/MgO and CoFe/HfO2 interfaces and its effect on the magnetic anisotropy of Ta/CoFe/MgO (HfO2) films. Through x-ray photoelectron spectroscopy, we found that the Fe–O bonds exist at both CoFe/MgO and CoFe/HfO2 interfaces at the as-deposited state due to the oxidation of interfacial Fe atoms during the deposition of the MgO and HfO2 layers. After annealing, the amount of the Fe–O bonds at the CoFe/MgO interface decreases, whereas at the CoFe/HfO2 interface, it increases, indicating that the oxygen atoms migrate from Fe–O bonds to MgO layers at the CoFe/MgO interface, whereas they migrate from the HfO2 layer to Fe–O bonds at the CoFe/HfO2 interface. Correspondingly, the magnetic anisotropy energy decreases in the Ta/CoFe/MgO film but increases in the Ta/CoFe/HfO2 film after annealing. We attributed these results to interfacial Fe 3d–O 2p orbital hybridization modulated by different oxygen migration behaviors. Our results may improve the understanding of the oxygen migration effect on magnetic anisotropy and anomalous Hall sensitivity in ferromagnet/oxide heterostructures.
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Research context
OpenAlex topics: ZnO doping and properties · Magnetic properties of thin films · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Physics and Chemistry, University of Science and Technology Beijing 1 , Beijing 100083, China
Beijing Laboratory of Metallic Materials and Processing for Modern Transportation 2 , Beijing 100083, China
Institute of Optoelectronics and Nanomaterials, MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology 3 , Nanjing 210094, China
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China
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