SPUTTERING TARGET FOR FORMING PERPENDICULAR MAGNETIC RECORDING MEDIUM FILM HAVING LOW RELATIVE PERMEABILITY

摘要

Disclosed is a sputtering target for forming a perpendicular magnetic recording medium film, which has a constituent composition composed of 0.5-15% by mole of a nonmagnetic oxide, 4-20% by mole of Cr, 5-25% by mole of Pt and the balance of Co and unavoidable impurities. The sputtering target has a structure wherein a Co-Cr two-component alloy phase, a Pt phase and a nonmagnetic oxide phase are uniformly dispersed.