Structural, Magnetic and Transport Properties of Co2Cr 1-xFexAl Full-Heusler Alloys

Susumu Okamura; Ryota Goto; Nobuki Tezuka; Satoshi Sugimoto; Koichiro Inomata

doi:10.2320/jinstmet.68.114

Structural, Magnetic and Transport Properties of Co₂Cr _1-xFe_xAl Full-Heusler Alloys

Susumu Okamura, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto, Koichiro Inomata

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

Abstract

The structural, magnetic and transport properties are investigated for the full-Heusler alloy Co₂(Cr_1-xFe_x) Al (CCFA) thin films deposited on thermally oxidized Si substrates at room temperature (RT). X-ray diffraction reveals that the films possess the B2 structure for x=0, decrease the atomic site ordering by substituting Fe for Cr (x=0.4∼0.6) and form the A2 structure for x=1. Both the magnetic moment and the Currie temperature of the films increase with increasing Fe content (x), although the moment for x<1 is significantly smaller than that of the calculated value for the L2₁ structure. Spin-valve type tunneling junctions with CCFA films are also fabricated by using metal masks, which demonstrate tunneling magnetoresistance (TMR) of 19% for x=0.4 at RT and 27% at 5 K despite the atomic site disorder. This is the largest TMR observation at RT with half metallic ferromagnets.

Original language	English
Pages (from-to)	114-117
Number of pages	4
Journal	Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume	68
Issue number	2
DOIs	https://doi.org/10.2320/jinstmet.68.114
Publication status	Published - 2004 Feb

Keywords

B2 structure
Full-Heusler alloy
Half-metallic ferromagnet
Thin film
Tunneling magnetoresistance

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.2320/jinstmet.68.114

Cite this

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title = "Structural, Magnetic and Transport Properties of Co2Cr 1-xFexAl Full-Heusler Alloys",

abstract = "The structural, magnetic and transport properties are investigated for the full-Heusler alloy Co2(Cr1-xFex) Al (CCFA) thin films deposited on thermally oxidized Si substrates at room temperature (RT). X-ray diffraction reveals that the films possess the B2 structure for x=0, decrease the atomic site ordering by substituting Fe for Cr (x=0.4∼0.6) and form the A2 structure for x=1. Both the magnetic moment and the Currie temperature of the films increase with increasing Fe content (x), although the moment for x<1 is significantly smaller than that of the calculated value for the L21 structure. Spin-valve type tunneling junctions with CCFA films are also fabricated by using metal masks, which demonstrate tunneling magnetoresistance (TMR) of 19% for x=0.4 at RT and 27% at 5 K despite the atomic site disorder. This is the largest TMR observation at RT with half metallic ferromagnets.",

keywords = "B2 structure, Full-Heusler alloy, Half-metallic ferromagnet, Thin film, Tunneling magnetoresistance",

author = "Susumu Okamura and Ryota Goto and Nobuki Tezuka and Satoshi Sugimoto and Koichiro Inomata",

year = "2004",

month = feb,

doi = "10.2320/jinstmet.68.114",

language = "English",

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AU - Okamura, Susumu

AU - Goto, Ryota

AU - Tezuka, Nobuki

AU - Sugimoto, Satoshi

AU - Inomata, Koichiro

PY - 2004/2

Y1 - 2004/2

N2 - The structural, magnetic and transport properties are investigated for the full-Heusler alloy Co2(Cr1-xFex) Al (CCFA) thin films deposited on thermally oxidized Si substrates at room temperature (RT). X-ray diffraction reveals that the films possess the B2 structure for x=0, decrease the atomic site ordering by substituting Fe for Cr (x=0.4∼0.6) and form the A2 structure for x=1. Both the magnetic moment and the Currie temperature of the films increase with increasing Fe content (x), although the moment for x<1 is significantly smaller than that of the calculated value for the L21 structure. Spin-valve type tunneling junctions with CCFA films are also fabricated by using metal masks, which demonstrate tunneling magnetoresistance (TMR) of 19% for x=0.4 at RT and 27% at 5 K despite the atomic site disorder. This is the largest TMR observation at RT with half metallic ferromagnets.

AB - The structural, magnetic and transport properties are investigated for the full-Heusler alloy Co2(Cr1-xFex) Al (CCFA) thin films deposited on thermally oxidized Si substrates at room temperature (RT). X-ray diffraction reveals that the films possess the B2 structure for x=0, decrease the atomic site ordering by substituting Fe for Cr (x=0.4∼0.6) and form the A2 structure for x=1. Both the magnetic moment and the Currie temperature of the films increase with increasing Fe content (x), although the moment for x<1 is significantly smaller than that of the calculated value for the L21 structure. Spin-valve type tunneling junctions with CCFA films are also fabricated by using metal masks, which demonstrate tunneling magnetoresistance (TMR) of 19% for x=0.4 at RT and 27% at 5 K despite the atomic site disorder. This is the largest TMR observation at RT with half metallic ferromagnets.

KW - B2 structure

KW - Full-Heusler alloy

KW - Half-metallic ferromagnet

KW - Thin film

KW - Tunneling magnetoresistance

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