Abstract
The inclination of the magnetization characteristic around the coercivity, λ(=(dM/dH)H=Hc), of a perpendicular magnetic recording medium is regarded attributable to magnetic interactions among magnetic grains in the medium. Magnetic interactions in [Co/Pd]n multilayer films with strong perpendicular magnetic anisotropy and different λ were studied using ferromagnetic Hall effect measurement, which detects the behavior of the perpendicular magnetization component even when an inclined magnetic field is applied. Specimens with high λ at Hc revealed a sharper and larger positive peak in the ΔV curves an evaluation index for magnetic interaction using the Hall effect than whose with low λ, indicating the dominance of strong exchange interaction among the particles.
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