Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z23: Domains Walls, Spin Textures and Artificially Structured Materials
11:30 AM–2:18 PM,
Friday, March 8, 2024
Room: 101C
Sponsoring
Unit:
GMAG
Chair: Eleanor Clements, Oak Ridge National Laboratory
Abstract: Z23.00012 : Imaging of magnetization response of soft magnetic thin film using diamond quantum sensors with wide frequency range*
1:42 PM–1:54 PM
Presenter:
Ryota Kitagawa
(Tokyo Institute of Technology)
Authors:
Ryota Kitagawa
(Tokyo Institute of Technology)
Aoi Nakatsuka
(Tokyo Institute of Technology)
Teruo Kohashi
(Hitachi, Ltd.)
Takeyuki Tsuji
(Tokyo Institute of Technology)
Honami Nitta
(Tokyo Institute of Technology)
Yota Takamura
(Tokyo Institute of Technology)
Shigeki Nakagawa
(Tokyo Institute of Technology)
Takayuki Iwasaki
(Tokyo Institute of Technology)
Amir Yacoby
(Harvard University)
Mutsuko Hatano
(Tokyo Institute of Technology)
Using nitrogen-vacancy centers, we performed simultaneous imaging of the amplitude and phase of the AC stray field from a CoFeB-SiO2 thin film, developed for high-frequency inductors. This film has low conductivity derived from the structure of nanomagnetic columns dispersed in an insulator matrix and in-plane uniaxial anisotropy. We imaged a 100-10 kHz AC field by continuous-wave optically-detected magnetic resonance with frequency modulation of the microwave, where the AC signal is down-converted to DC and captured by the camera's speed. The magnetic response correlated with the anisotropy. When the external field was parallel to the easy axis, the phase delayed as frequency increased, implying the loss increased. When perpendicular, the phase didn't delay up to 5 kHz, implying the loss was almost zero. Diamond quantum sensors will help evaluate loss in inductors.
*This work was supported by the MEXT Quantum Leap Flagship Program (JPMXS0118067395) and JST SPRING (JPMJSP2106).
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