Tunneling spin polarization and magnetic properties of Co-Fe-B alloys and their dependence on boron content

Takahide Kubota; Tadaomi Daibou; Mikihiko Oogane; Yasuo Ando; Terunobu Miyazaki

doi:10.1143/JJAP.46.L250

Tunneling spin polarization and magnetic properties of Co-Fe-B alloys and their dependence on boron content

Takahide Kubota, Tadaomi Daibou, Mikihiko Oogane, Yasuo Ando, Terunobu Miyazaki

ENG - Applied Physics

Tohoku University

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

20 Citations (Scopus)

Abstract

Tunneling spin polarization (TSP) of (Co₅₀Fe₅₀) _100-xB_x alloys with various boron contents is measured by superconducting tunneling spectroscopy (STS). Because magnetic tunnel junctions (MTJs) using Co-Fe-B alloys exhibit a large tunnel magnetoresistance (TMR) effect, they are highly valued materials; in addition, the TSP of Co-Fe-B alloys is expected to be high. The maximum observed TSP value is 49% for (Co ₅₀Fe₅₀)₈₀B₂₀, which is higher than that of pure Co₅₀Fe₅₀ (37%). An X-ray diffraction pattern showed that the structure of (Co₅₀Fe₅₀)₈₀B ₂₀ is amorphous. We infer that the structure is changed to the amorphous state by increasing the boron content, which enhances the TSP of Co-Fe-B alloys.

Original language	English
Pages (from-to)	L250-L252
Journal	Japanese Journal of Applied Physics
Volume	46
Issue number	8-11
DOIs	https://doi.org/10.1143/JJAP.46.L250
Publication status	Published - 2007 Mar 9

Keywords

Amorphous ferromagnet
Co-Fe-B
Superconducting tunneling spectroscopy
Tunnel magnetoresistance
Tunneling spin polarization

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10.1143/JJAP.46.L250

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title = "Tunneling spin polarization and magnetic properties of Co-Fe-B alloys and their dependence on boron content",

abstract = "Tunneling spin polarization (TSP) of (Co50Fe50) 100-xBx alloys with various boron contents is measured by superconducting tunneling spectroscopy (STS). Because magnetic tunnel junctions (MTJs) using Co-Fe-B alloys exhibit a large tunnel magnetoresistance (TMR) effect, they are highly valued materials; in addition, the TSP of Co-Fe-B alloys is expected to be high. The maximum observed TSP value is 49% for (Co 50Fe50)80B20, which is higher than that of pure Co50Fe50 (37%). An X-ray diffraction pattern showed that the structure of (Co50Fe50)80B 20 is amorphous. We infer that the structure is changed to the amorphous state by increasing the boron content, which enhances the TSP of Co-Fe-B alloys.",

keywords = "Amorphous ferromagnet, Co-Fe-B, Superconducting tunneling spectroscopy, Tunnel magnetoresistance, Tunneling spin polarization",

author = "Takahide Kubota and Tadaomi Daibou and Mikihiko Oogane and Yasuo Ando and Terunobu Miyazaki",

year = "2007",

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T1 - Tunneling spin polarization and magnetic properties of Co-Fe-B alloys and their dependence on boron content

AU - Kubota, Takahide

AU - Daibou, Tadaomi

AU - Oogane, Mikihiko

AU - Ando, Yasuo

AU - Miyazaki, Terunobu

PY - 2007/3/9

Y1 - 2007/3/9

N2 - Tunneling spin polarization (TSP) of (Co50Fe50) 100-xBx alloys with various boron contents is measured by superconducting tunneling spectroscopy (STS). Because magnetic tunnel junctions (MTJs) using Co-Fe-B alloys exhibit a large tunnel magnetoresistance (TMR) effect, they are highly valued materials; in addition, the TSP of Co-Fe-B alloys is expected to be high. The maximum observed TSP value is 49% for (Co 50Fe50)80B20, which is higher than that of pure Co50Fe50 (37%). An X-ray diffraction pattern showed that the structure of (Co50Fe50)80B 20 is amorphous. We infer that the structure is changed to the amorphous state by increasing the boron content, which enhances the TSP of Co-Fe-B alloys.

AB - Tunneling spin polarization (TSP) of (Co50Fe50) 100-xBx alloys with various boron contents is measured by superconducting tunneling spectroscopy (STS). Because magnetic tunnel junctions (MTJs) using Co-Fe-B alloys exhibit a large tunnel magnetoresistance (TMR) effect, they are highly valued materials; in addition, the TSP of Co-Fe-B alloys is expected to be high. The maximum observed TSP value is 49% for (Co 50Fe50)80B20, which is higher than that of pure Co50Fe50 (37%). An X-ray diffraction pattern showed that the structure of (Co50Fe50)80B 20 is amorphous. We infer that the structure is changed to the amorphous state by increasing the boron content, which enhances the TSP of Co-Fe-B alloys.

KW - Amorphous ferromagnet

KW - Co-Fe-B

KW - Superconducting tunneling spectroscopy

KW - Tunnel magnetoresistance

KW - Tunneling spin polarization

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Tunneling spin polarization and magnetic properties of Co-Fe-B alloys and their dependence on boron content

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Keywords

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