Browse Prior Art Database

Logical Device

IP.com Disclosure Number: IPCOM000098133D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Yhap, EF: AUTHOR [+3]

Abstract

Certain semiconductive materials, e.g., Indium Antimonide (I(n)S(b)) act as diodes when subjected to a magnetic field. As shown in the upper drawings, this action is achieved by placing a piece of semiconductive material between a pair of ohmic contacts and roughening one side to permit high surface recombination of carriers traversing the material. The opposite face is etched smooth to reduce surface recombination.

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Logical Device

Certain semiconductive materials, e.g., Indium Antimonide (I(n)S(b)) act as diodes when subjected to a magnetic field. As shown in the upper drawings, this action is achieved by placing a piece of semiconductive material between a pair of ohmic contacts and roughening one side to permit high surface recombination of carriers traversing the material. The opposite face is etched smooth to reduce surface recombination.

With potentials applied to the contacts as shown, a magnetic field into the plane of the paper diverts carriers toward the roughened surface where they recombine, substantially no carriers reaching the negative terminal. This is equivalent to a reversely biassed diode. Reversing the magnetic field in a direction out of the plane of the paper diverts carriers towards the smooth surface. Since surface recombination is low however, substantially all of the carriers reach the negative contact. Relatively high conduction is achieved and the element is equivalent to a forwardly biassed diode.

This phenomenon is utilized in the device illustrated in the lower drawing. A pair of semiconductive devices, such as described above, are embedded in a magnetic core having a rectangular hysteresis characteristic. Windings cc' and dd' are oppositely oriented to provide magnetic fields of opposite polarity in response to input signals of the same polarity. With the square loop characteristic, the magnetic field can be established by a pulse which occurs ...