Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers

Jin Oh Song; Seong Rae Lee

doi:10.1016/j.jmmm.2006.10.608

Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers

Jin Oh Song, Seong Rae Lee

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

5 Citations (Scopus)

Abstract

We investigated the composition dependence of the microstructure and magnetic properties of Co₉₀Fe₁₀-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co₉₀Fe₁₀-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co₉₀Fe₁₀ layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.

Original language	English
Pages (from-to)	1923-1925
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.608
Publication status	Published - 2007 Mar

Bibliographical note

Funding Information:
This work was supported by grants from the Korea Research Foundation (KRF-2004-005-C00068) and the Basic Research Program of the KOSEF (R-01-2005-000-11188-0).

Keywords

Amorphous CoFeZr
MTJ
Microstructure
Stability

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2006.10.608

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Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers. / Song, Jin Oh; Lee, Seong Rae.
In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 3, 03.2007, p. 1923-1925.

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

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title = "Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers",

abstract = "We investigated the composition dependence of the microstructure and magnetic properties of Co90Fe10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co90Fe10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co90Fe10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.",

keywords = "Amorphous CoFeZr, MTJ, Microstructure, Stability",

author = "Song, {Jin Oh} and Lee, {Seong Rae}",

note = "Funding Information: This work was supported by grants from the Korea Research Foundation (KRF-2004-005-C00068) and the Basic Research Program of the KOSEF (R-01-2005-000-11188-0).",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.608",

language = "English",

volume = "310",

pages = "1923--1925",

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AU - Song, Jin Oh

AU - Lee, Seong Rae

N1 - Funding Information: This work was supported by grants from the Korea Research Foundation (KRF-2004-005-C00068) and the Basic Research Program of the KOSEF (R-01-2005-000-11188-0).

PY - 2007/3

Y1 - 2007/3

N2 - We investigated the composition dependence of the microstructure and magnetic properties of Co90Fe10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co90Fe10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co90Fe10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.

AB - We investigated the composition dependence of the microstructure and magnetic properties of Co90Fe10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co90Fe10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co90Fe10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.

KW - Amorphous CoFeZr

KW - MTJ

KW - Microstructure

KW - Stability

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JO - Journal of Magnetism and Magnetic Materials

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IS - 2 SUPPL. PART 3

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Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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