Accession Number : AD0665286

Title :   A NEGATIVE-RESISTANCE MAGNETORESISTIVE CIRCUIT,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : Green,Milton

Report Date : 08 JAN 1968

Pagination or Media Count : 31

Abstract : A negative-resistance circuit that consists of a magnetoresistor situated in the magnetic field produced by two magnetomotive forces (MMF's) is described. The winding of one of the MMF's is connected serially with the magnetoresistor. The negative-resistance region is determined by the condition b-B > dB/d lnRm, where B is the magnetic field at the magnetoresistor, b is the bias field (produced by the second MMF alone), and Rm(B) is the magnetic-field dependence of the magnetoresistor. For a quadratic magnetoresistor characteristic, this condition becomes Rm(b) > 4R(0). The negative-resistance characteristics of a superconductor magnetoresistor are presented. Switching of the modes and the stable amplification region of the circuit is discussed. Experimental results for indium antimonide (at 193K) and bismuth (at 4.2K) magnetoresistors are given. (Author)

Descriptors :   (*NEGATIVE RESISTANCE CIRCUITS, MAGNETIC PROPERTIES), SEMICONDUCTORS, SUPERCONDUCTORS, AMPLIFIERS, RELAXATION OSCILLATORS, EXPERIMENTAL DATA, INDIUM COMPOUNDS, BISMUTH, INTEGRAL EQUATIONS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE