Enhanced Exchange Bias in Epitaxial High-Entropy Oxide Heterostructures

Wang，Hailin1; Huang，Haoliang2,3; Feng，Yanpeng4; Ku，Yu Chieh5; Liu，Cheng En5; Chen，Shanquan1; Farhan，Alan6; Piamonteze，Cinthia7; Lu，Yalin2; Tang，Yunlong8; Wei，Jun9; Chen，Lang3; Chang，Chun Fu10; Kuo，Chang Yang5,11; Chen，Zuhuang1,9

2023-12-20

10.1021/acsami.3c14943

ACS Applied Materials and Interfaces   影响因子和分区

1944-8244

1944-8252

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(CrMnFeCoNi)O 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(CrMnFeCoNi)O layer with a thickness down to 1 nm can be used as a pinning layer and strongly coupled with a ferromagnetic LaSrMnO 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.

epitaxial films exchange bias effect heterostructures high-entropy oxides perovskite oxide

EI ; SCI

英语

其他

20235115247361

Chromium compounds ; Cobalt compounds ; Electronic structure ; Entropy ; High resolution transmission electron microscopy ; Iron compounds ; Lanthanum compounds ; Manganese compounds ; Nickel compounds ; Oxide films ; Scanning electron microscopy ; Strontium compounds ; Transition metals ; X ray absorption spectroscopy

Minerals:482.2 ; Metallurgy and Metallography:531 ; Thermodynamics:641.1 ; Optical Devices and Systems:741.3 ; Atomic and Molecular Physics:931.3

2-s2.0-85180084277

Scopus

1.School of Materials Science and Engineering,Harbin Institute of Technology,Shenzhen,518055,China
2.Anhui Laboratory of Advanced Photon Science and Technology & Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei,230026,China
3.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
4.Songshan Lake Materials Laboratory,Dongguan,523808,China
5.Department of Electrophysics,National Yang Ming Chiao Tung University,Hsinchu,30010,Taiwan
6.Department of Physics,Baylor University,Waco,76798,United States
7.Paul Scherrer Institut,Villigen,Forschungstrasse 111,5232,Switzerland
8.Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China
9.Flexible Printed Electronics Technology Center,Harbin Institute of Technology,Shenzhen,518055,China
10.Max-Planck Institute for Chemical Physics of Solids,Dresden,Nöthnitzer Str. 40,01187,Germany
11.National Synchrotron Radiation Research Center,Hsinchu,101 Hsin-Ann Road,30076,Taiwan

Wang，Hailin,Huang，Haoliang,Feng，Yanpeng,et al. Enhanced Exchange Bias in Epitaxial High-Entropy Oxide Heterostructures[J]. ACS Applied Materials and Interfaces,2023,15(50):58643-58650.

Wang，Hailin.,Huang，Haoliang.,Feng，Yanpeng.,Ku，Yu Chieh.,Liu，Cheng En.,...&Chen，Zuhuang.(2023).Enhanced Exchange Bias in Epitaxial High-Entropy Oxide Heterostructures.ACS Applied Materials and Interfaces,15(50),58643-58650.

Wang，Hailin,et al."Enhanced Exchange Bias in Epitaxial High-Entropy Oxide Heterostructures".ACS Applied Materials and Interfaces 15.50(2023):58643-58650.