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Thickness and oxidation dependence of magnetic properties of ultrathin obliquely evaporated Co-CoO media

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2 Author(s)
Motohashi, K. ; Recording Media Co., Sony Corp., Miyagi, Japan ; Onodera, S.

Magnetic properties of ultrathin obliquely evaporated Co-CoO media particularly targeted for a helical scanning tape system using high-sensitivity giant magnetoresistive heads were investigated. By introducing oxygen, decoupling of magnetostatic interaction between ferromagnetic particles led to a maximum value of coercivity at a certain oxygen amount. Coercivity was also sharply deteriorated by decreasing the magnetic layer thickness. Analysis of magnetic torque measurement revealed that obliquely evaporated Co-CoO media has an initial growth layer with a thickness of 10.2 nm. Application of a SiO2 underlayer is effective in preventing the deterioration of coercivity for thin magnetic media design.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )