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Magnetic properties of evaporated CoCr films

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2 Author(s)
S. Honda ; Hiroshima University, Higashi-Hiroshima, Japan ; J. Storer

Perpendicular magnetic CoCr films were prepared on glass substrates using electron beam evaporation. The magnetic properties depend strongly on the substrate temperature, Ts. The anisotropy field, H_{k}^{eff} , and the perpendicular coercivity, Hc( \perp ) show maximum values at Tsaround 250°C. In this case, the alignment of c-axis is optimal and the grain size is smallest. The lattice spacing of the c-planes increases wlth Tsuntil 300°C. When the films prepared below 200°C were annealed around 300°C in high vacuum, the saturation magnetization, Ms, increased. The value of Ms, however, decrease by annealing above 400°C. In spite of the decrease of Msdue to the annealing above 400°C, H_{k}^{eff} and Hc( \perp ) increase by annealing above 400°C. If the films were bombarded by argon ions during film growth, Msdecreased and the internal stress changed from tensile to compressive. For low substrate temperature (below 150°C), H_{k}^{eff} decreased due to ion bombardment.

Published in:

IEEE Transactions on Magnetics  (Volume:22 ,  Issue: 5 )