A rocksalt-structure high entropy oxide (AlCrFeNiMn)O film with room-temperature ferromagnetism

•Rocksalt-structure (AlCrFeNiMn)O high entropy oxide (RA-HEO) films were designed for the first time by sputtering deposition.•RA-HEO films exhibit room temperature ferromagnetic order.•The magnetic exchange of magnetic cations induced RT ferromagnetic of RA-HEO film. Rocksalt-structure high entropy...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-11, Vol.538, p.168271, Article 168271
Main Authors: Sun, Sen, Yang, ZhaoMing, Qiu, Nan, Yang, HengMing, Chen, Hong, Zhang, JianCong, Wu, BaoZhen, Cao, YingXin, Luo, DongWei, Zhang, Kun, Wang, Yuan
Format: Article
Language:English
Subjects:
Antiferromagnetism
Cations
Entropy
Ferromagnetic order
Ferromagnetism
HEOs
Magnetic materials
Magnetic saturation
Orbitals
Rocksalt-structure
Room temperature
Superexchange
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Summary:•Rocksalt-structure (AlCrFeNiMn)O high entropy oxide (RA-HEO) films were designed for the first time by sputtering deposition.•RA-HEO films exhibit room temperature ferromagnetic order.•The magnetic exchange of magnetic cations induced RT ferromagnetic of RA-HEO film. Rocksalt-structure high entropy oxides (HEOs) usually exhibit antiferromagnetic ordering characteristics. Here, we report for the first time the ferromagnetic order of a rocksalt-structure (AlCrFeNiMn)O high entropy oxide (RA-HEO), whose saturation magnetization reaches 164 emu/cm3 at room temperature, despite substantial chemical disorders. The rocksalt-structure HEOs exhibit ferromagnetic order only when their magnetic cations contain both the unoccupied eg orbitals and half-filled eg orbitals. Our works give fundamental insight into the role of the orbital state of magnetic cations and associated superexchange mechanism in rocksalt-structure HEOs.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168271