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Reduction of Ordering Temperature of FePt--Al2O3 Thin Films by N2 Addition During Sputtering |
| CAO Jiang-Wei1;N. Katayama2;YANG Zheng1;WEI Fu-Lin1;M. Matsumoto2;A. Morisako25;LIU Xiao-Xi2;S. Takei2 |
| 1Research Institute of Magnetic Materials, Lanzhou University, Lanzhou 730000
2Department of Information Engineering, Shinshu University, 4-17-I Wakasato, Nagano 380-8553, Japan |
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| Cite this article: |
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CAO Jiang-Wei, N. Katayama, YANG Zheng et al 2005 Chin. Phys. Lett. 22 2899-2902 |
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Abstract We investigate the effect of N2 addition during sputtering on the microstructure and magnetic properties of FePt--Al2O3 thin films. The texture of FePt phase in FePt--Al2O3 thin films changes from (111) to a more random orientation by N2 addition during sputtering. The ordering temperature of FePt phase reduces about 100°C with appropriate N2 partial pressure. A larger coercivity of 6.0×105A/m is obtained with N2 partial pressure about 15%. Structural analysis reveals that a small quantity of Fe3N phase forms during sputtering and the release of N atoms during the post annealing induces a large number of vacancies in the films, which benefits to the transformation of FePt phase from fcc to fct.
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| Keywords:
61.10.Nz
68.55.Jk
75.50.Ss
75.60.Ej
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Published: 01 November 2005
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