Lorentz microscopy study on the magnetization reversal process in Co-Zr-O nanogranular magnetic films

Youhui Gao; Zheng Liu; Daisuke Shindo; Shigehiro Ohnuma; Hiroyasu Fujimori

doi:10.1109/TMAG.2004.832477

Lorentz microscopy study on the magnetization reversal process in Co-Zr-O nanogranular magnetic films

Youhui Gao, Zheng Liu, Daisuke Shindo, Shigehiro Ohnuma, Hiroyasu Fujimori

Center for Advanced Microscopy and Spectroscopy

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

1 Citation (Scopus)

Abstract

The domain structure and the magnetization reversal process in Co ₇₁Zr₁₃O₁₆ granular thin film, governed by a perpendicular anisotropy, are reported. Pattern of maze domains is observed, and the configuration is refined by the surface magnetic charges with function of specimen thickness. The wall energy is reduced by the low effective anisotropy and the exchange constant mediated by the amorphous layer. The magnetization reversal process is characterized by two magnetization rotation and one Barkhausen jump processes. The Barkhausen jumps easily take place at "Y" junctions of the stripe domains, where the distribution of the surface charges is irregular; the magnetization rotations are nonuniform in order to meet the requirement of the decrease in the demagnetization energy. 360° domain walls are found after Barkhausen jumps, indicating some pinning sites in the film.

Original language	English
Pages (from-to)	2709-2711
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	40
Issue number	4 II
DOIs	https://doi.org/10.1109/TMAG.2004.832477
Publication status	Published - 2004 Jul

Keywords

360° domain wall
Barkhausen jump
Co-Zr-O
Maze domain
Nanogranular thin film

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Lorentz microscopy study on the magnetization reversal process in Co-Zr-O nanogranular magnetic films",

abstract = "The domain structure and the magnetization reversal process in Co 71Zr13O16 granular thin film, governed by a perpendicular anisotropy, are reported. Pattern of maze domains is observed, and the configuration is refined by the surface magnetic charges with function of specimen thickness. The wall energy is reduced by the low effective anisotropy and the exchange constant mediated by the amorphous layer. The magnetization reversal process is characterized by two magnetization rotation and one Barkhausen jump processes. The Barkhausen jumps easily take place at {"}Y{"} junctions of the stripe domains, where the distribution of the surface charges is irregular; the magnetization rotations are nonuniform in order to meet the requirement of the decrease in the demagnetization energy. 360° domain walls are found after Barkhausen jumps, indicating some pinning sites in the film.",

keywords = "360° domain wall, Barkhausen jump, Co-Zr-O, Maze domain, Nanogranular thin film",

author = "Youhui Gao and Zheng Liu and Daisuke Shindo and Shigehiro Ohnuma and Hiroyasu Fujimori",

note = "Funding Information: Manuscript received October 13, 2003. This work was supported in part by the 21th Century COE Program. Y. Gao and D. Shindo are with Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan (e-mail: ygao@mail.tagen.tohoku.ac.jp). S. Ohnuma and H. Fujimori are with the Research Institute for Electric and Magnetic Materials, Sendai 982-0807, Japan. Digital Object Identifier 10.1109/TMAG.2004.832477",

year = "2004",

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doi = "10.1109/TMAG.2004.832477",

language = "English",

volume = "40",

pages = "2709--2711",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "4 II",

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AU - Gao, Youhui

AU - Liu, Zheng

AU - Shindo, Daisuke

AU - Ohnuma, Shigehiro

AU - Fujimori, Hiroyasu

N1 - Funding Information: Manuscript received October 13, 2003. This work was supported in part by the 21th Century COE Program. Y. Gao and D. Shindo are with Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan (e-mail: ygao@mail.tagen.tohoku.ac.jp). S. Ohnuma and H. Fujimori are with the Research Institute for Electric and Magnetic Materials, Sendai 982-0807, Japan. Digital Object Identifier 10.1109/TMAG.2004.832477

PY - 2004/7

Y1 - 2004/7

N2 - The domain structure and the magnetization reversal process in Co 71Zr13O16 granular thin film, governed by a perpendicular anisotropy, are reported. Pattern of maze domains is observed, and the configuration is refined by the surface magnetic charges with function of specimen thickness. The wall energy is reduced by the low effective anisotropy and the exchange constant mediated by the amorphous layer. The magnetization reversal process is characterized by two magnetization rotation and one Barkhausen jump processes. The Barkhausen jumps easily take place at "Y" junctions of the stripe domains, where the distribution of the surface charges is irregular; the magnetization rotations are nonuniform in order to meet the requirement of the decrease in the demagnetization energy. 360° domain walls are found after Barkhausen jumps, indicating some pinning sites in the film.

AB - The domain structure and the magnetization reversal process in Co 71Zr13O16 granular thin film, governed by a perpendicular anisotropy, are reported. Pattern of maze domains is observed, and the configuration is refined by the surface magnetic charges with function of specimen thickness. The wall energy is reduced by the low effective anisotropy and the exchange constant mediated by the amorphous layer. The magnetization reversal process is characterized by two magnetization rotation and one Barkhausen jump processes. The Barkhausen jumps easily take place at "Y" junctions of the stripe domains, where the distribution of the surface charges is irregular; the magnetization rotations are nonuniform in order to meet the requirement of the decrease in the demagnetization energy. 360° domain walls are found after Barkhausen jumps, indicating some pinning sites in the film.

KW - 360° domain wall

KW - Barkhausen jump

KW - Co-Zr-O

KW - Maze domain

KW - Nanogranular thin film

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Lorentz microscopy study on the magnetization reversal process in Co-Zr-O nanogranular magnetic films

Abstract

Keywords

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