| 摘要 |
PURPOSE:To form a magnetically oriented layer which has high adhesive stength to a substrate layer, has high mechanical and thermal impact strength, and is improved in contact with a head by providing the substrate layer incorporated with a soft magnetic material in an org. polymer compd. and a vertical magnetically oriented layer provided on the surface thereof. CONSTITUTION:An org. polymer compd. is a compd. that permits filming, and is more specifically, mixtures and copolymers of various polymers such as acrylic polymers and various resins such as polycarbonate resins having preferably >=5,000mol.wt. and >=50kg/mm.<2> modulus of elasticity in tension at <=50 deg.C. A soft magnetic material is magnetic materials such as silicon steels contg. ''Permalloys'' and part of ferrites having preferably <=2.0 oersted coercive force and >=2,000 initial magnetic permeability. >=80wt%. Particles of the magnetic material are preferably 0.02-0.5mu long diameter. A vertical magnetically oriented layer is a layer consisting of alloys such as Co-Cr composed essentially of Co, and a ferromagnetic material such as Ba-ferrite having most preferably >=400 oersted coercive force. |
