Monte Carlo modeling of magnetic properties in magnetic granular films for high-density recording

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概要

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• In this paper, magnetic properties of Co-C and CoPt-C nanogranular films are modled using the Monte Carlo method. Each grain in the films is assumed to be spherical in shape, with a single domain and a random crystalline easy axis in the model. For Co-C films, the hysteresis loop for hexagonal close-packed(hcp)Co grains of 3 nm in size is calculated at various temperatures ranging from 3__- K to 300 K. The superparamagnetic relaxation blocking temperature(T_B)is demonstrated to be about 20 K. For CoPt-C films, hysteresis magnetization calculations are performed on face-central-tetragonal(fct)Copt inter-metal compound grains encapsulated in carbon with various grain sizes ranging from 4 nm to 6 nm and different ditributions. Extremelry high coercivities required by ultra-high density magnetic recording are achieved in these films owing to the very large anisotropy of fct CoPt compound. The numerical results are compared with our experimental data of Co-C granular films and those of CoPt-C granular films rekently reported in the literatures.

• 社団法人電子情報通信学会の論文
• 2001-10-31

著者

• Wong S.p.

  Department Of Electronic Engineering And Materials Science And Technology Research Center The Chines

• WANG H.

  Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University

• HU L.

  Institute of Geography Science, Xinjiang Normal University

• Li Wei

  Institute Of Thin Films And Nanomaterials Department Of Mathematics And Physics Wuyi University

• Chiah M.F.

  Department of Electronic Enginneering The Chinese University of Hong Kong

• Chiah M.f.

  Department Of Electronic Engineering And Materials Science And Technology Research Center The Chines

• Wang H.

  Department Of Electronic Engineering And Materials Science And Technology Research Center The Chines

• Zhou G.R.

  Institute of Thin Films and Nanomaterials, Department of Mathematics and Physics, Wuyi University

• Wu S.

  Institute of Thin Films and Nanomaterials, Department of Mathematics and Physics, Wuyi University

• Poon C.Y.

  Department of Electronic Engineering and Materials Science and Technology Research Center, The Chine

• Poon C.y

  Department Of Electronic Engineering And Materials Science And Technology Research Center The Chines

• Zhou G.r.

  Institute Of Thin Films And Nanomaterials Department Of Mathematics And Physics Wuyi University

• Wang Hao

  Institute Of Automobile Engineering Shanghai Jiao Tong University

• Poon C.

  Department Of Electronic Engineering & Materials Science And Technology Research Centre The Chin

• Wang H.

  Institute Of Aeronautics And Astronautics National Cheng Kung University

• Li Wei

  Institute Of Plant Protection Jiangsu Academy Of Agricultural Sciences

• Hu Lin

  Institute of Thin Films and Nanomaterials, Department of Mathematics and Physics, Wuyi University

• LI Wei

  Institute of Automatic Control Engineering. Technische Universitat Munchen

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