Dual particle population magnetic recording medium

Details Dual particle population magnetic recording medium Dual particle population magnetic recording medium

1975-01-27

1976-10-12

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Recording on or reproducing from an element of diverse utility

Card

360131, 235 6112M, 340149A, G11B 2504

Patent

active

039862054

ABSTRACT:
A magnetic recording medium having at least two particle populations that may be either contained in a single layer of magnetic medium or a dual layer of magnetic medium. In a first embodiment one of the particle populations of the medium is formed of conventional magnetic recording particles and the other population is highly anisotropic. In a second embodiment both particle populations are highly anisotropic but they are aligned so that the easy axes of magnetization of the populations are at an angle to one another. Also disclosed is a machine readable magnetic recording document that employs the magnetic recording medium of the present invention, and an apparatus for reading such document and validating the same.

REFERENCES:
patent: 3864754 (1975-02-01), Miklos et al.
patent: 3878367 (1975-04-01), Fayling et al.

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