Published March 2007 | Version v1
Journal article Metadata-only

Dependence of tunnel magnetoresistance on ferromagnetic electrode materials in MgO-barrier magnetic tunnel junctions

Creators

  • 1. Laboratory for Nanoelectronics and Spintronics, RIEC, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)
  • 2. Advanced Research Laboratory, Hitachi, Ltd., 1-280 Higashi-koigakubo, Kokubunji-shi, Tokyo 185-8601 (Japan)

Description

We investigated the relationship between the tunnel magnetoresistance (TMR) ratio and the electrode structure in MgO-barrier magnetic tunnel junctions (MTJs). The TMR ratio in an MTJ with Co40Fe40B20 reference and free layers reached 355% at the post-deposition annealing temperature of T a=400 deg. C . When Co50Fe50 or Co90Fe10 is used for the reference layer material, no high TMR ratio was observed. The key to have high TMR ratio is to have highly oriented (0 0 1) MgO barrier/CoFeB crystalline electrodes. The highest TMR ratio obtained so far is 450% at T a=450 deg. C in a pseudo-spin-valve MTJ

Additional details

Identifiers

DOI
10.1016/j.jmmm.2006.10.770;
arXiv
arXiv:cond-mat/0608551v1;
PII
S0304-8853(06)02005-1;

Publishing Information

Journal Title
Journal of Magnetism and Magnetic Materials
Journal Volume
310
Journal Issue
2
Journal Page Range
p. 1937-1939
ISSN
0304-8853
CODEN
JMMMDC

Conference

Title
17. international conference on magnetism
Dates
20-25 Aug 2006
Place
Kyoto (Japan)

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
39022171
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ANNEALING; BORON ALLOYS; COBALT ALLOYS; DEPOSITION; ELECTRODES; IRON ALLOYS; LAYERS; MAGNESIUM OXIDES; MAGNETORESISTANCE; SPIN; SUPERCONDUCTING JUNCTIONS; TUNNEL EFFECT
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALLOYS; ANGULAR MOMENTUM; CHALCOGENIDES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; HEAT TREATMENTS; MAGNESIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; TRANSITION ELEMENT ALLOYS

Optional Information

Copyright
Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.