Evolution of Magnetic State of Ultrathin Co Films with Volmer-Weber Growth
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- Shiratsuchi Yu
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University Frontier Research Center, Graduate School of Engineering, Osaka University
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- Murakami Tatsuya
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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- Endo Yasushi
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University Frontier Research Center, Graduate School of Engineering, Osaka University
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- Yamamoto Masahiko
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University Frontier Research Center, Graduate School of Engineering, Osaka University
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抄録
The surface structure and magnetic state of ultrathin Co films with Volmer–Weber growth (V–W growth) on α-Al2O3(0001) have been investigated as a function of Co thickness. Due to V–W growth, Co forms particles with a diameter of approximately 5 nm. Originating from the particle structure, the magnetic state of Co is superparamagnetism below a thickness of 1.1 nm, and evolves to ferromagnetism as the Co thickness increases. The transition occurs for a wide thickness range, i.e., 1 to 3 nm. Due to the wide-range transition, it enables to observe the coexistence of superparamagnetism and ferromagnetism at a thickness of around 2 nm. The wide range transition of the magnetic state is explained by the slow coalescence of Co particles. The structural transition would be dominated by the large interface energy between Co and α-Al2O3(0001).
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 44 (12), 8456-8461, 2005
The Japan Society of Applied Physics
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詳細情報 詳細情報について
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- CRID
- 1390001206267674112
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- NII論文ID
- 10016958772
- 130004533023
- 210000059157
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- NII書誌ID
- AA10457675
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- ISSN
- 13474065
- 00214922
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- NDL書誌ID
- 7747752
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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