Magnetic recording elements, process for making the same and the

Details Magnetic recording elements, process for making the same and the Magnetic recording elements, process for making the same and the

1981-04-13

1984-05-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

360134, 360135, 360136, 252 6254, 427128, 428328, 428694, 428695, 428900, G11B 570

Patent

active

044515359

ABSTRACT:
Magnetic recording elements having at least one magnetic recording layer containing acicular magnetic particles that have magnetocrystalline anisotropy, shape anisotropy which provides a preferred axis of magnetization and a coercivities of at least 450 Oersteds. These particles are dispersed in a binder and form a distribution that imparts an isotropic magnetic response to the magnetic recording layer.
A Process for preparing the above magnetic recording elements is also disclosed. According to this process, the aforementioned magnetic particles are dispersed in a liquid medium. The dispersion is formed into a magnetic recording layer while establishing a distribution of particles that has spherically symmetrical magnetic properties (symmetry that is three-dimensional). The layer is then solidified while maintaining this distribution.
A magnetic recording method is also disclosed. This method involves (1) providing a signal modulated magnetic field by means of a gapped magnetic ring head, (2) subjecting to that field a magnetic recording layer of the type previously described and (3) causing relative motion between the head and the layer.

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patent: 4338643 (1982-07-01), Tadakoro
"The Physics of Magnetic Recording", C. D. Mee, 1964, John Wiley and Sons, Inc., New York, pp. 141, 167-168 and 192.
Research Disclosure, vol. 187, Nov. 1979, Item 1872, pp. 665-666, published by Industrial Opportunities Ltd., Homewell, Havant Hampshire PO9 1EF, United Kingdom.
Iwasaki et al. "Perpendicular Magnetic Recording With a Composite Anisotropic Film", IEEE Transactions on Magnetics, vol. MAG-15, No. 6, pp. 1456-1458, Nov. 1979.
J. U. Lemke, "Ultra High Density Recording with New Heads and Tapes", IEEE Transactions on Magnetics, vol. MAG-15, No. 6, Nov. 1979.

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