Magnetic Domain Imaging of Ni Micro Ring and Micro Dot array by Photoelectron Emission Microscopy
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概要
- 論文の詳細を見る
The magnetic domain structures of Ni micro ring (the inner and outer diameters are changed in a micrometer region) and micro dot array with different shapes and with a small separation between dots were observed by the combined method of photoelectron emission microscopy and X-ray magnetic circular dichroism. For the micro rings with a large inner diameter, a flux-closure (FC) domain structure tends to appear more easily than for those with a small inner diameter. This means that the FC domain structure of the micro rings with a large inner diameter is energetically more stable than those of the micro rings with a small inner diameter and the disks. After applying an external pulsed magnetic field of about 40 mT in the in-plane direction, each domain structure switched to an almost perfect single-domain structure. Because of the absence of a central vortex core in the ring as compared with the disks, exchange energy decreases substantially. These phenomena are discussed along with the simulation results. For the micro dot array, the interaction between dots was directly observed. Particularly for the circular disks with a small diameter showing FC domains, no interaction is observed due to the lack of stray fields from each disk. On the other hand, dots with multi domain structures interacted. These types of information may provide us fundamental knowledge for designing high-density magnetic recording media.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-07-15
著者
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Matsushima Takeshi
The Institute For Solid State Physics The University Of Tokyo
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OKUDA Taichi
The Institute for Solid State Physics, The University of Tokyo
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YOKOO Atsushi
NTT Basic Research Laboratories
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KINOSHITA Toyohiko
The Institute for Solid State Physics, The University of Tokyo
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Kihara Takayuki
Department Of Engineering The University Of Tokyo
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Wakita Takanori
The Institute For Solid State Physics The University Of Tokyo
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Kiwata Hideyuki
Department Of Engineering The University Of Tokyo
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Harasawa Ayumi
The Institute For Solid State Physics The University Of Tokyo
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Ono Kanta
Department Of Applied Chemistry The University Of Tokyo
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Oshima Masaharu
Department Of Applied Chemistry Graduate School Of Engineering The University Of Tokyo
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Wakita Takanori
The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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Ono Kanta
Department of Engineering, The University of Tokyo, Tokyo 113-8685, Japan
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Kihara Takayuki
Department of Engineering, The University of Tokyo, Tokyo 113-8685, Japan
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Matsushima Takeshi
The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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Kinoshita Toyohiko
The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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Okuda Taichi
The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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Kiwata Hideyuki
Department of Engineering, The University of Tokyo, Tokyo 113-8685, Japan
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Harasawa Ayumi
The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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OSHIMA Masaharu
Department of Applied Chemistry and JST-CREST, The University of Tokyo
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