The effects of tungsten concentration on crystalline structure and perpendicular magnetic anisotropy of Co-W films

S. Q. Yin, Y. Wu, X. G. Xu, H. Wang, J. P. Wang, Y. Jiang

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Abstract

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 Ku over 2.1 × 105 J/m3 after vacuum annealing. The perpendicular coercivity (Hc) of Co-W thin film reaches 9.1 × 104 A/m. Therefore, the Co-W thin film is considered as a potential choice of high-density magnetic recording media materials.

Original languageEnglish (US)
Article number127156
JournalAIP Advances
Volume4
Issue number12
DOIs
StatePublished - Dec 1 2014

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© 2014 Author(s).

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