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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.

Inventors:
 [1];  [2];  [1]
  1. (Berkeley, CA)
  2. (Oakland, CA)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
871912
Patent Number(s):
US 5824165
Assignee:
Regents, University of California (Oakland, CA) LBNL
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
giant; magnetoresistive; heterogeneous; alloys; method; inventive; material; exhibits; magnetoresistance; application; external; magnetic; field; temperature; hysteresis; minimal; phase; formed; eutectic; decomposition; bulk; comprises; plurality; regions; characterized; presence; lamellae; separated; distance; mean; free; path; conduction; electrons; matrix; composition; nonmagnetic; properties; interposed; rapidly; quenched; form; microstructure; antiparallel; antiferromagnetic; coupling; rise; gmr; materials; according; process; yielded; commercially; acceptable; quantities; timeframes; annealing; destroyed; effect; noneutectic; exhibit; possess; rapidly quenched; free path; mean free; magnetic field; material comprises; giant magnetoresistive; bulk material; magnetic properties; external magnetic; alloys form; inventive material; eutectic alloy; magnetic phase; material exhibits; conduction electrons; giant magnetoresistance; heterogeneous alloys; exhibits giant; form microstructure; magnetoresistive heterogeneous; /148/

Citation Formats

Bernardi, Johannes J., Thomas, Gareth, and Huetten, Andreas R. Giant magnetoresistive heterogeneous alloys and method of making same. United States: N. p., 1998. Web.
Bernardi, Johannes J., Thomas, Gareth, & Huetten, Andreas R. Giant magnetoresistive heterogeneous alloys and method of making same. United States.
Bernardi, Johannes J., Thomas, Gareth, and Huetten, Andreas R. Thu . "Giant magnetoresistive heterogeneous alloys and method of making same". United States. https://www.osti.gov/servlets/purl/871912.
@article{osti_871912,
title = {Giant magnetoresistive heterogeneous alloys and method of making same},
author = {Bernardi, Johannes J. and Thomas, Gareth and Huetten, Andreas 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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