Dependence of Noise in Magnetic Tunnel Junctions Sensors on Annealing Field and Temperature

reportActive / Technical Report | Accession Number: ADA496631 | Open PDF

Abstract:

The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic-ferromagnetic interface. In this study, we investigated the low frequency noise of magnetic tunnel junctions MTJs annealed in the temperature range from 265 to 305 degrees C and magnetic fields up to 7 T, either in helium or hydrogen environments. Our results indicate that the magnetic fluctuators in these MTJs changed their frequency based on annealing field and temperature. The noise of the MTJs at low frequency can be reduced by annealing in high magnetic field 7 T and further improved by annealing in a hydrogen environment.

Author(s):
Liou, S. H. ; Zhang, Rui ; Russek, Stephen E. ; Yuan, L. ; Halloran, Sean T. ; Pappas, David P.
Author Organization(s):
NEBRASKA UNIV LINCOLN DEPT OF PHYSICS AND ASTRONOMY
Descriptive Note:
Journal article
Supplementary Note:
Sponsored in part by the DoD Strategic Environmental Research and Development Program (SERDP) Grant no. MM-1569 and National Science Foundation Grant no. DMR-0213808. Prepared in collaboration with the National Institute of Standards and Technology, Boulder, CO. Published in the Journal of Applied Physics, v 103 n7 article 07E920, 2008. The original document contains color images.
Pagination:
0004

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
DAAD19-03-1-0298
Monitor Series:
ARO
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_6.3_Net Management; JCA_1_Force Support; JCA_1.3_Human Capital Management; JCA_8_Building Partnerships
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*TUNNELING(ELECTRONICS), *NOISE(ELECTRICAL AND ELECTROMAGNETIC), *JUNCTIONS, DETECTORS, MANUFACTURING, MAGNETORESISTANCE, HYDROGEN, LOW FREQUENCY, MAGNETIC FIELDS, ANNEALING, REPRINTS
Field(s)/Group(s):
Electrical and Electronic Equipment, Electricity and Magnetism
Keyword(s):
SENSOR NOISE, MTJ(MAGNETIC TUNNEL JUNCTIONS)
Report Date:
2008 Mar 07
Creation Date:
2009 Apr 29