Giant magnetoresistive heterogeneous alloys and method of making

Details Giant magnetoresistive heterogeneous alloys and method of making Giant magnetoresistive heterogeneous alloys and method of making

1997-11-25

1999-03-16

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, H01F 103

Patent

active

058824367

ABSTRACT:
The inventive material exhibits giant magnetoresistance upon application of an external magnetic field at room temperature. The hysteresis is minimal. The inventive material has a magnetic phase formed by eutectic decomposition. The bulk material comprises a plurality of regions characterized by a) the presence of magnetic lamellae wherein the lamellae are separated by a distance smaller than the mean free path of the conduction electrons, and b) a matrix composition having nonmagnetic properties that is interposed between the lamellae within the regions. The inventive, rapidly quenched, eutectic alloys form microstructure lamellae having antiparallel antiferromagnetic coupling and give rise to GMR properties. The inventive materials made according to the inventive process yielded commercially acceptable quantities and timeframes. Annealing destroyed the microstructure lamellae and the GMR effect. Noneutectic alloys did not exhibit the antiparallel microstructure lamellae and did not possess GMR properties.

REFERENCES:
Kuan et al., Chemical Abstract Accession No. 1981:630416, Negative Magnetoresistivity of a Rapidly Quenched Superconduscting Alloy Aluminum-11.3 at% Silicon, Wuli Xuebao (1981) 30(9) pp. 1284-1286, 1981.
Xiao et al., Chemical Abstracts Accession No. 1993:418375, A Study of Indium Antimonide-Nickel Monoantimonide Magnetoresistance Material, Sens. Actuators, A (1993), 35(3), 373-377, 1983.

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