TRULY UNCOUPLED SPIN VALVE MATERIAL

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 27357
Amount: $64,975.00
Phase: Phase I
Program: SBIR
Awards Year: 1994
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Nonvolatile Electronics Inc.
11409 Valley View Rd, Eden Prairie, MN, 55344
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 James M Daughton
 (612) 829-9217
Business Contact
Phone: () -
Research Institution
N/A
Abstract
SPIN VALVE MATERIALS HAVE GREAT APPLICATION POTENTIAL IN MAGNETORESISTIVE RANDOM ACCESS MEMORY (MRAM), TAPE OR DISK READ HEADS, AND MAGNETIC FIELD SENSORS. HOWEVER, POSITIVE COUPLING BETWEEN THE TWO MAGNETIC LAYERS IS ALWAYS PRESENT IN SO-CALLED "UNCOUPLED" SPIN VALVE MATERIALS TODAY AND PRESENTS A ROADBLOCK FOR THE WIDESPREAD USE OF THOSE MATERIALS. THIS COUPLING REDUCES THE EFFECTIVE ANISOTROPY FIELD FOR MRAM MEMORY CELLS, REDUCES FIELD SENSITIVITY FOR SENSORS, AND MAY PREVENT "SINGLE DOMAIN" BEHAVIOR IN SPIN VALVE DEVICES. POSITIVE COUPLING IS BELIEVED TO BE CAUSED BY CORRELATED ROUGHNESS OF THE INTERFACES OF THE MAGNETIC LAYERS THROUGH A DIPOLE-TO-DIPOLE COUPLING EFFECT. TO OBTAIN TRULY UNCOUPLED SPIN VALVE MATERIALS, RESEARCHERS ARE DEVELOPING A NUMBER OF APPROACHES TO CONTROL THE INTERFACE QUALITY AND FLATNESS, AND CRYSTAL ORIENTATION OF THE SPIN VALVE MATERIALS USING INDUSTRY-STANDARD EQUIPMENT. SOME OF THE PROPOSED APPROACHES MAY ALSO INDUCE A BENEFICIAL ANTIFERROMAGNETIC EXCHANGE COUPLING.

* information listed above is at the time of submission.

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government