Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1996-04-25

1999-05-25

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428212, 428213, 428216, 428336, 428469, 428472, 428694TS, 428694TM, 428900, G11B 566

Patent

active

059068809

ABSTRACT:
A magnetic recording medium, comprising a nonmagnetic substrate on the surface of which is deposited a magnetic layer. In one embodiment, the magnetic layer is formed of two thin films of magnetic metal and a layer of nonmagnetic material sandwiched therebetween, the layer of nonmagnetic material having a thickness no greater than 20% of the thickness of the magnetic layer, with the magnetic layer having an energy product of at least 100 gauss.multidot.cm.multidot.Oe as the product of its residual magnetic flux density, thickness and coercive force, and a surface roughness no greater than 0.003 .mu.m in center line average height. In another embodiment, the magnetic layer, which may be a single layer of magnetic metal film or may be of the aforementioned multiple layer construction, is vacuum deposited onto the substrate at an incident angle in the range of 30.degree. to 70.degree..

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IEEE Transactions on Consumer Electronics vol. 35, No. 3, 1989, New York, US pp. 421-427 Chiba et al. Metal Evaporated Tape for High Band 8mm Video System p. 422, line 28--p. 425, line 17; FIG. 3.
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