The effects of tungsten concentration on crystalline structure and perpendicular magnetic anisotropy of Co-W films
- State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
- Department of Electrical and Computer Engineering and the Center for Micromagnetics and Information Technologies (MINT), University of Minnesota, Minneapolis, MN 55455 (United States)
In this study, Co-W thin films deposited by DC magnetron sputtering were demonstrated to be perpendicular magnetic anisotropic with large magnetocrystalline anisotropy energy (MAE). Thermodynamic calculations based on Miedema’s semi-empirical model have been used to estimate the phase in this binary alloy system. Based on the thermodynamic calculations results, a series of Co-W thin films were deposited on amorphous Ta underlayer with different tungsten concentrations. According to the X-ray diffraction results, the crystal structure of Co-W thin films is consistent well with that of thermodynamic calculations. Large MAE of Co-W thin films can be obtained with K{sub u} over 2.1 × 10{sup 5} J/m{sup 3} after vacuum annealing. The perpendicular coercivity (H{sub c}) of Co-W thin film reaches 9.1 × 10{sup 4} A/m. Therefore, the Co-W thin film is considered as a potential choice of high-density magnetic recording media materials.
- OSTI ID:
- 22420228
- Journal Information:
- AIP Advances, Vol. 4, Issue 12; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
- Country of Publication:
- United States
- Language:
- English
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