Magneto-optic media and system optimization

Details Magneto-optic media and system optimization Magneto-optic media and system optimization

1982-02-25

1984-08-14

Kilgore, Robert Martin

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

365122, 369 84, G11B 532, G11B 364, G11B 728, G11C 1306

Patent

active

044660359

ABSTRACT:
Magneto-optic media and system optimization including a set of optimized magneto-optic media for use in a magneto-optic recording and readout system employing an incident readout light beam of a given fixed power, P.sub.o. The beam is delivered in a linearly polarized state to the magneto-optic media and the magneto-optic radiation received from the media is detectable by the system. Each member of the set of media comprises a reflective layer having a predetermined thickness, a first transparent layer overlying the reflecting layer and having a predetermined thickness and refractive index and a second light transmissive layer having a predetermined thickness and exhibiting absorptivity at the wavelength of said incident readout light beam and having magneto-optic conversivity and perpendicular anisotropy. Members of the set of optimized magneto-optic media may further included a third transparent layer overlaying the second transmissive layer and having a predetermined thickness and refractive index. The combination of these layers exhibit antireflectivity and the incident light absorbed in the media is captured in the second light transmissive layer and the predetermined layer thicknesses and refractive index are chosen to maximize signal to noise ratio (SNR) according to the relationship ##EQU1## where r.sub.x represents the reflected component of the linearly polarized incident beam r.sub.y represents the reflected magneto-optically induced component in an orthogonal direction, a.sub.i is the i.sup.th element of the set }a.sub.i }0 that represents variable parameters of the chosen readout system, N is the number of elements in the set {a.sub.i } and f is a function which is determined by the chosen readout system.

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