Control of Soft Magnetism of Co-Zr and Co-Zr-Ta Films for Backlayers in Perpendicular Magnetic Recording Media
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概要
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Co-Zr and Co-Zr-Ta amorphous films were prepared by the Kr sputtering method for use as the backlayers of Co-Cr perpendicular magnetic recording tape media. The effect of the addition of Ta to Co-Zr thin films was also investigated. Lower substrate temperature was required to prepare amorphous Co-Zr films with excellent soft magnetic properties. The relationships among Ta content x, magnetostriction constant λ and magnetic characteristics such as coercivity H_c and relative permeability μ_r were clarified. A method of evaluating λ of soft magnetic thin films deposited on polymer sheet substrate has been presented. Films with composition of (Co_lt95.7gtZr_lt4.3gt)_lt100-xgt Ta_x at x of 10 at.% possessed sufficiently soft magnetic properties such as low H_c below 80 A/m and high μ_r above 600. Addition of Ta was effective in changing change the sign of λ from positive to negative. It was found that the negative magnetoelastic energy and the smaller λ caused the soft magnetism.
- 社団法人電子情報通信学会の論文
- 1995-11-25
著者
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Naoe Masahiko
Faculty Of Engineering Tokyo Institute Of Technology
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Nakagawa Shigeki
Faculty Of Engineering Tokyo Institute Of Technology
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