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Magneto-Optical Memory

IP.com Disclosure Number: IPCOM000097371D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Eggenberger, JS: AUTHOR

Abstract

This magneto-optical memory employs two uniaxial, anisotropic magnetic thin film elements per binary bit. Multiple reflections between elements are utilized in reading out the information retained in each bit position. Thus, polarized light in the system is allowed to shine on all bit positions simultaneously.

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Magneto-Optical Memory

This magneto-optical memory employs two uniaxial, anisotropic magnetic thin film elements per binary bit. Multiple reflections between elements are utilized in reading out the information retained in each bit position. Thus, polarized light in the system is allowed to shine on all bit positions simultaneously.

A first film element 10 is affixed to one side of a transparent substrate member 12 in alignment with a second film element 14 affixed to an opposite surface of member 12 for storing a binary bit.

As indicated by arrows adjacent the surface of elements 10 and 14, opposite stable states of magnetization are established in it to define 1 and 0 conditions. Source 16 directs polarized light to the surface of element 14 affixed to substrate 12 to cause reflection off a similar surface of film 10 to analyzer detector 18.

Assuming a stored 1 condition, polarized light is reflected in a given rotated form off the surface of element 14 and is again reflected off the surface of element 10 in opposite rotated form to the analyzer detector 18. A datum light intensity is detected. This datum light intensity is also detected for a stored binary 0 condition. For readout, the element 10 has its magnetization established in a stable state which causes maximum rotation of the polarized light in a given direction and, hence, maximum light detection. This is when the element 14 is magnetized in a stable state defining a stored binary 1.

For a bit-organiz...