Abstract
Microstructure, mechanical and magnetic properties of FeCo films deposited onto underlayers of Ti, V, Cr, Co, Ni, Cu, Ta, and Pd have been investigated. The microstructure, magnetic, electric properties and internal stress of the FeCo films sensitively depended on the underlayers. The grain size, magnetic softness and electrical resistivity can be tailored in a wide range by the unerlayers. The coercive mechanism of the FeCo films qualitatively follows the random anisotropy model. FeCo films deposited onto underlayers with bcc structure (Ti, V, Cr) show relatively low compressive stress. Large tensile stress was found for FeCo films deposited onto underlayers with fcc structure (Ni, Cu, Pd). FeCo films with smaller grain size and low internal stress normally preferred to have lower coercivity. The electric resistivity of the films can be tailored in a wide range by choosing different underlayers.
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