Wide-field imaging of the magnetization process in soft magnetic-thin film using diamond quantum sensors

Ryota Kitagawa; Teruo Kohashi; Takeyuki Tsuji; Shunsuke Nagata; Aoi Nakatsuka; Honami Nitta; Yota Takamura; Shigeki Nakagawa; Takayuki Iwasaki; Mutsuko Hatano

doi:10.35848/1882-0786/ad1002

Applied Physics Express (Jan 2023)

Wide-field imaging of the magnetization process in soft magnetic-thin film using diamond quantum sensors

Ryota Kitagawa,
Teruo Kohashi,
Takeyuki Tsuji,
Shunsuke Nagata,
Aoi Nakatsuka,
Honami Nitta,
Yota Takamura,
Shigeki Nakagawa,
Takayuki Iwasaki,
Mutsuko Hatano

Affiliations

Ryota Kitagawa: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Teruo Kohashi: ORCiD; Research & Development Group, Hitachi, Ltd., 2520 Akanuma, Hatoyama, Saitama, 350-0395, Japan
Takeyuki Tsuji: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Shunsuke Nagata: School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Aoi Nakatsuka: School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Honami Nitta: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Yota Takamura: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Shigeki Nakagawa: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Takayuki Iwasaki: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
Mutsuko Hatano: ORCiD; School of Engineering, Tokyo Institute of Technology , 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan

DOI: https://doi.org/10.35848/1882-0786/ad1002
Journal volume & issue: Vol. 17, no. 1
p. 017002

Abstract

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The magnetization process of a soft magnetic CoFeB-SiO _2 thin film was imaged using diamond quantum sensors with perfectly aligned nitrogen-vacancy centers along the [111] direction formed by CVD. Around the film edge, the easy and hard axes directions exhibited different responses to the external magnetic field, consistent with ones observed by magneto-optical Kerr effect microscopy. Moreover, quantum diamond imaging could observe discontinuous magnetization along domain walls as non-uniform magnetic charges (MCs). Quantum diamond imaging would help in visualization through MCs, such as irregularity in the material and relative orientation of magnetizations in neighboring domains.

Published in Applied Physics Express

ISSN: 1882-0778 (Print); 1882-0786 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1882-0786

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