Magnetic domain structure of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy

Joonghoe Dho; Jungbae Kim

doi:10.1016/j.tsf.2022.139361

Magnetic domain structure of the ferrimagnetic (001) NiCo₂O₄ film with perpendicular magnetic anisotropy

Joonghoe Dho, Jungbae Kim

Department of Physics

Kyungpook National University

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

A 65-nm thick epitaxial (001) NiCo₂O₄ film that has metallic and ferrimagnetic properties at room temperature was grown on a (001) MgAl₂O₄ substrate. Evolutions in magnetic domains of the ferrimagnetic (001) NiCo₂O₄ film with perpendicular magnetic anisotropy were observed using polar magneto-optical Kerr effect microscopy with changes in magnetic field, temperature, or time. The magnetic domain structure in the magnetic field exhibited noticeable changes around a coercive field; whereas, its change in temperature or time at a fixed magnetic field was indistinct. This suggests that the ferrimagnetic (001) NiCo₂O₄ film has a relatively stable magnetic domain structure in comparison with Co alloy films with perpendicular magnetic anisotropy and fast domain wall motion. Conclusively, the magnetic domain variation in the NiCo₂O₄ film signified that the magnetization process at an early stage was mainly caused by domain rotation behavior rather than domain wall motion.

Original language	English
Article number	139361
Journal	Thin Solid Films
Volume	756
DOIs	https://doi.org/10.1016/j.tsf.2022.139361
State	Published - 31 Aug 2022

Keywords

Magnetic domain structure
Perpendicular magnetic anisotropy
Spinel oxides

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10.1016/j.tsf.2022.139361

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title = "Magnetic domain structure of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy",

abstract = "A 65-nm thick epitaxial (001) NiCo2O4 film that has metallic and ferrimagnetic properties at room temperature was grown on a (001) MgAl2O4 substrate. Evolutions in magnetic domains of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy were observed using polar magneto-optical Kerr effect microscopy with changes in magnetic field, temperature, or time. The magnetic domain structure in the magnetic field exhibited noticeable changes around a coercive field; whereas, its change in temperature or time at a fixed magnetic field was indistinct. This suggests that the ferrimagnetic (001) NiCo2O4 film has a relatively stable magnetic domain structure in comparison with Co alloy films with perpendicular magnetic anisotropy and fast domain wall motion. Conclusively, the magnetic domain variation in the NiCo2O4 film signified that the magnetization process at an early stage was mainly caused by domain rotation behavior rather than domain wall motion.",

keywords = "Magnetic domain structure, Perpendicular magnetic anisotropy, Spinel oxides",

author = "Joonghoe Dho and Jungbae Kim",

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year = "2022",

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doi = "10.1016/j.tsf.2022.139361",

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T1 - Magnetic domain structure of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy

AU - Dho, Joonghoe

AU - Kim, Jungbae

PY - 2022/8/31

Y1 - 2022/8/31

N2 - A 65-nm thick epitaxial (001) NiCo2O4 film that has metallic and ferrimagnetic properties at room temperature was grown on a (001) MgAl2O4 substrate. Evolutions in magnetic domains of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy were observed using polar magneto-optical Kerr effect microscopy with changes in magnetic field, temperature, or time. The magnetic domain structure in the magnetic field exhibited noticeable changes around a coercive field; whereas, its change in temperature or time at a fixed magnetic field was indistinct. This suggests that the ferrimagnetic (001) NiCo2O4 film has a relatively stable magnetic domain structure in comparison with Co alloy films with perpendicular magnetic anisotropy and fast domain wall motion. Conclusively, the magnetic domain variation in the NiCo2O4 film signified that the magnetization process at an early stage was mainly caused by domain rotation behavior rather than domain wall motion.

AB - A 65-nm thick epitaxial (001) NiCo2O4 film that has metallic and ferrimagnetic properties at room temperature was grown on a (001) MgAl2O4 substrate. Evolutions in magnetic domains of the ferrimagnetic (001) NiCo2O4 film with perpendicular magnetic anisotropy were observed using polar magneto-optical Kerr effect microscopy with changes in magnetic field, temperature, or time. The magnetic domain structure in the magnetic field exhibited noticeable changes around a coercive field; whereas, its change in temperature or time at a fixed magnetic field was indistinct. This suggests that the ferrimagnetic (001) NiCo2O4 film has a relatively stable magnetic domain structure in comparison with Co alloy films with perpendicular magnetic anisotropy and fast domain wall motion. Conclusively, the magnetic domain variation in the NiCo2O4 film signified that the magnetization process at an early stage was mainly caused by domain rotation behavior rather than domain wall motion.

KW - Magnetic domain structure

KW - Perpendicular magnetic anisotropy

KW - Spinel oxides

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DO - 10.1016/j.tsf.2022.139361

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JO - Thin Solid Films

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Magnetic domain structure of the ferrimagnetic (001) NiCo₂O₄ film with perpendicular magnetic anisotropy

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Keywords

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