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
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
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.
(Magnetization curves, hysteresis, Barkhausen and related effects)
引用本文:
CAO Jiang-Wei;N. Katayama;YANG Zheng;WEI Fu-Lin;M. Matsumoto;A. Morisako;LIU Xiao-Xi;S. Takei. Reduction of Ordering Temperature of FePt--Al2O3 Thin Films by N2 Addition During Sputtering[J]. 中国物理快报, 2005, 22(11): 2899-2902.
CAO Jiang-Wei, N. Katayama, YANG Zheng, WEI Fu-Lin, M. Matsumoto, A. Morisako, LIU Xiao-Xi, S. Takei. Reduction of Ordering Temperature of FePt--Al2O3 Thin Films by N2 Addition During Sputtering. Chin. Phys. Lett., 2005, 22(11): 2899-2902.
2005, Vol. 22 
