TY - JOUR
T1 - Nano-granular Co-Zr-O magnetic films studied by HRTEM and electron holography
AU - Liu, Zheng
AU - Shindo, Daisuke
AU - Ohnuma, Shigehiro
AU - Fujimori, Hiroyasu
N1 - Funding Information:
The authors are grateful to “The Kazato Research Foundation” for partial support of this work. They thank Dr. T. Ohsuna and Professor K. Hiraga, Institute for Materials Research, Tohoku University for their support on phase reconstruction and interest. They also thank Dr. T. Oikawa, JEOL Ltd., and Dr. Y.H. Gao, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, for valuable discussions. Finally the authors wish to thank Professor T. Masumoto, The Research Institute for Electric and Magnetic Materials, for his warm encouragement.
Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2003/6
Y1 - 2003/6
N2 - The microstructures and magnetic domain structures of nano-granular Co-Zr-O thin films (Co71.5Zr9.2O19.3, Co59.9Zr10.3O29.8 and Co52.9Zr12.0O35.1) with different magnetic properties were investigated by transmission electron microscopy. High-resolution transmission electron microscopy (HRTEM) reveals that these Co-Zr-O thin films are all composed of nano-sized Co crystal grains dispersing in the Co-Zr-O amorphous matrix. The detailed distribution of lines of magnetic flux in each specimen is clarified by electron holography. In the specimen of Co59.9Zr10.3O29.8, which has the highest magnetic anisotropy field, the existence of 180° magnetic domain walls is clarified. The Co52.9Zr12.0O35.1, which has the smallest Co grain size, has reticulate domain walls or fluctuated lines of magnetic flux, suggesting the mixed state of ferromagnetic and superparamagnetic states.
AB - The microstructures and magnetic domain structures of nano-granular Co-Zr-O thin films (Co71.5Zr9.2O19.3, Co59.9Zr10.3O29.8 and Co52.9Zr12.0O35.1) with different magnetic properties were investigated by transmission electron microscopy. High-resolution transmission electron microscopy (HRTEM) reveals that these Co-Zr-O thin films are all composed of nano-sized Co crystal grains dispersing in the Co-Zr-O amorphous matrix. The detailed distribution of lines of magnetic flux in each specimen is clarified by electron holography. In the specimen of Co59.9Zr10.3O29.8, which has the highest magnetic anisotropy field, the existence of 180° magnetic domain walls is clarified. The Co52.9Zr12.0O35.1, which has the smallest Co grain size, has reticulate domain walls or fluctuated lines of magnetic flux, suggesting the mixed state of ferromagnetic and superparamagnetic states.
KW - Co-Zr-O thin film
KW - Electron holography
KW - Magnetic domain
KW - Nano-granular
KW - TEM
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U2 - 10.1016/S0304-8853(02)01526-3
DO - 10.1016/S0304-8853(02)01526-3
M3 - Article
AN - SCOPUS:0038137118
SN - 0304-8853
VL - 262
SP - 308
EP - 315
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 2
ER -