Magnetic properties of Co-Ni-Fe-M(M = Rh,Ir,Pd,Pt) films prepared by sputtering have been investigated. Addition of Pd decreases the magnetostriction constant of the films from 1 x 10-5 to around zero. On the other hand, addition of other elements, such as Rh, Ir, and Pt, increases it. However, coercive forces of Co-Ni-Fe-Pd films become more than 10 Oe when the magnetostriction is less than 2 x 10-6. multilayered films were investigated to obtain films with low coercive force. 43Co-27Ni-15Fe-15Pd films of 0.17 μm and A12O3 films of 0.01 μm in thickness are layered time-sequentially. This multilayered film has saturation induction of 1.4 T, around zero magnetostriction, and a low coercive force of 1.5 Oe. Furthermore, Co-Ni-Fe-Pd films were ascertained to be resistant to corrosion as Permalloy films. Recording heads with multilayered Co-Ni-Fe-Pd films with Al2O3 interlayers as magnetic cores have been fabricated. Recording characteristics were evaluated. These laminated Co-Ni-Fe-Pd/Al2O3 heads exhibit about 6 dB better overwrite than Permalloy heads.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering