Enhanced Exchange Bias in Epitaxial High-Entropy Oxide Heterostructures

Hailin Wang, Haoliang Huang, Yanpeng Feng, Yu Chieh Ku, Cheng En Liu, Shanquan Chen, Alan Farhan, Cinthia Piamonteze, Yalin Lu, Yunlong Tang, Jun Wei, Lang Chen, Chun Fu Chang, Chang Yang Kuo*, Zuhuang Chen*

*此作品的通信作者

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

High-entropy oxides (HEOs) have gained significant interest in recent years due to their unique structural characteristics and potential to tailor functional properties. However, the electronic structure of the HEOs currently remains vastly unknown. In this work, combining magnetometry measurements, scanning transmission electron microscopy, and element-specific X-ray absorption spectroscopy, the electronic structure and magnetic properties of the perovskite-HEO La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 epitaxial thin films are systemically studied. It is found that enhanced magnetic frustration emerges from competing exchange interactions of the five transition-metal cations with energetically favorable half-filled/full-filled electron configurations, resulting in an unprecedented large vertical exchange bias effect in the single-crystalline films. Furthermore, our findings demonstrate that the La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 layer with a thickness down to 1 nm can be used as a pinning layer and strongly coupled with a ferromagnetic La0.7Sr0.3MnO3 layer, leading to a notable exchange bias and coercivity enhancement in a cooling field as small as 5 Oe. Our studies not only provide invaluable insight into the electronic structure of HEOs but also pave the way for a new era of large bias materials for spintronics devices.

原文English
頁(從 - 到)58643-58650
頁數8
期刊ACS Applied Materials and Interfaces
15
發行號50
DOIs
出版狀態Published - 20 12月 2023

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