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Title: Giant magnetoresistive heterogeneous alloys and method of making same

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. 7 figs.

Inventors:
; ;
Issue Date:
Research Org.:
University of California
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
675857
Patent Number(s):
5,824,165
Application Number:
PAN: 8-526,745
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 360104; 360102; 360101; PA: EDB-99:002417; SN: 98002028003
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 20 Oct 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNETORESISTANCE; MAGNETIC FIELDS; HYSTERESIS; MICROSTRUCTURE; ALLOYS; EUTECTICS; DESIGN

Citation Formats

Bernardi, J.J., Thomas, G., and Huetten, A.R. Giant magnetoresistive heterogeneous alloys and method of making same. United States: N. p., 1998. Web.
Bernardi, J.J., Thomas, G., & Huetten, A.R. Giant magnetoresistive heterogeneous alloys and method of making same. United States.
Bernardi, J.J., Thomas, G., and Huetten, A.R. Tue . "Giant magnetoresistive heterogeneous alloys and method of making same". United States.
@article{osti_675857,
title = {Giant magnetoresistive heterogeneous alloys and method of making same},
author = {Bernardi, J.J. and Thomas, G. and Huetten, A.R.},
abstractNote = {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. 7 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {10}
}