Published April 20, 2009 | Version v1
Journal article Metadata-only

Improved tunnel magnetoresistance of magnetic tunnel junctions with Heusler Co2FeAl0.5Si0.5 electrodes fabricated by molecular beam epitaxy

Creators

  • 1. Department of Materials Science, Graduate School of Engineering, Tohoku University, Aobayama 6-6-02, Sendai 980-8579 (Japan)

Description

The authors have developed a magnetic tunnel junction of Co2FeAl0.5Si0.5 electrodes and a MgO barrier fabricated by molecular beam epitaxy and observed that this device had a tunnel magnetoresistance ratio of 386% at approximately 300 K and 832% at 9 K. The lower Co2FeAl0.5Si0.5 electrode was annealed during and after deposition resulting in a highly ordered structure with small roughness. This highly ordered structure could be obtained by annealing treatment even at low temperatures. Furthermore, a weak temperature dependence of the tunnel magnetoresistance ratio was observed for the developed magnetic tunnel junction.

Additional details

Identifiers

DOI
10.1063/1.3116717;

Publishing Information

Journal Title
Applied Physics Letters
Journal Volume
94
Journal Issue
16
Journal Page Range
p. 162504-162504.3
ISSN
0003-6951
CODEN
APPLAB

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
41040109
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANNEALING; COBALT ALLOYS; CRYSTAL GROWTH; DEPOSITION; ELECTRODES; FERROMAGNETIC MATERIALS; HEUSLER ALLOYS; IRON ALLOYS; LAYERS; MAGNESIUM OXIDES; MAGNETORESISTANCE; MOLECULAR BEAM EPITAXY; ROUGHNESS; SILICON ALLOYS; SUPERCONDUCTING JUNCTIONS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0273-0400 K; TUNNEL EFFECT
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALLOYS; ALUMINIUM ALLOYS; CHALCOGENIDES; COPPER ALLOYS; COPPER BASE ALLOYS; CORROSION RESISTANT ALLOYS; CRYSTAL GROWTH METHODS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; EPITAXY; HEAT TREATMENTS; MAGNESIUM COMPOUNDS; MAGNETIC MATERIALS; MANGANESE ALLOYS; MATERIALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SURFACE PROPERTIES; TEMPERATURE RANGE; TRANSITION ELEMENT ALLOYS

Optional Information

Notes
(c) 2009 American Institute of Physics