High spin polarization at the Fe/C60 interface in the Fe-doped C60 film

Seiji Sakai; Yoshihiro Matsumoto; Manabu Ohtomo; Shiro Entani; Pavel V. Avramov; Pavel B. Sorokin; Hiroshi Naramoto

doi:10.1016/j.synthmet.2012.10.027

High spin polarization at the Fe/C₆₀ interface in the Fe-doped C₆₀ film

Seiji Sakai, Yoshihiro Matsumoto, Manabu Ohtomo, Shiro Entani, Pavel V. Avramov, Pavel B. Sorokin, Hiroshi Naramoto

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

1 Scopus citations

Abstract

A process of tunneling conduction and the spin-dependent resistivity change (so-called tunneling magnetoresistance effect) in the Fe-doped C₆₀ film with a granular structure is investigated for the current-into-plane device. Cooperative tunneling (cotunneling) through several Fe nanoparticles is suggested to be operative at temperatures lower than 20 K. By considering the effect of cotunneling on the magnetoresistance ratio, it is successfully shown that the spin polarization of tunneling electrons generated at the Fe/C ₆₀ interface is much higher than that in Fe crystal at low temperature in a similar fashion to that at the Co/C₆₀ interface in the Co-doped C₆₀ films. A strong temperature dependence of spin polarization is observed, suggesting a possible influence by the thermally induced disorders ascribed to the Fe atoms bonded with C₆₀ in the C₆₀ Fe compound.

Original language	English
Pages (from-to)	22-25
Number of pages	4
Journal	Synthetic Metals
Volume	173
DOIs	https://doi.org/10.1016/j.synthmet.2012.10.027
State	Published - 2013

Keywords

Fullerene
Magnetic metal
Spin polarization
Spinterfaces
TMR effect

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10.1016/j.synthmet.2012.10.027

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title = "High spin polarization at the Fe/C60 interface in the Fe-doped C60 film",

abstract = "A process of tunneling conduction and the spin-dependent resistivity change (so-called tunneling magnetoresistance effect) in the Fe-doped C60 film with a granular structure is investigated for the current-into-plane device. Cooperative tunneling (cotunneling) through several Fe nanoparticles is suggested to be operative at temperatures lower than 20 K. By considering the effect of cotunneling on the magnetoresistance ratio, it is successfully shown that the spin polarization of tunneling electrons generated at the Fe/C 60 interface is much higher than that in Fe crystal at low temperature in a similar fashion to that at the Co/C60 interface in the Co-doped C60 films. A strong temperature dependence of spin polarization is observed, suggesting a possible influence by the thermally induced disorders ascribed to the Fe atoms bonded with C60 in the C60 Fe compound.",

keywords = "Fullerene, Magnetic metal, Spin polarization, Spinterfaces, TMR effect",

author = "Seiji Sakai and Yoshihiro Matsumoto and Manabu Ohtomo and Shiro Entani and Avramov, {Pavel V.} and Sorokin, {Pavel B.} and Hiroshi Naramoto",

year = "2013",

doi = "10.1016/j.synthmet.2012.10.027",

language = "English",

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journal = "Synthetic Metals",

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TY - JOUR

T1 - High spin polarization at the Fe/C60 interface in the Fe-doped C60 film

AU - Sakai, Seiji

AU - Matsumoto, Yoshihiro

AU - Ohtomo, Manabu

AU - Entani, Shiro

AU - Avramov, Pavel V.

AU - Sorokin, Pavel B.

AU - Naramoto, Hiroshi

PY - 2013

Y1 - 2013

N2 - A process of tunneling conduction and the spin-dependent resistivity change (so-called tunneling magnetoresistance effect) in the Fe-doped C60 film with a granular structure is investigated for the current-into-plane device. Cooperative tunneling (cotunneling) through several Fe nanoparticles is suggested to be operative at temperatures lower than 20 K. By considering the effect of cotunneling on the magnetoresistance ratio, it is successfully shown that the spin polarization of tunneling electrons generated at the Fe/C 60 interface is much higher than that in Fe crystal at low temperature in a similar fashion to that at the Co/C60 interface in the Co-doped C60 films. A strong temperature dependence of spin polarization is observed, suggesting a possible influence by the thermally induced disorders ascribed to the Fe atoms bonded with C60 in the C60 Fe compound.

AB - A process of tunneling conduction and the spin-dependent resistivity change (so-called tunneling magnetoresistance effect) in the Fe-doped C60 film with a granular structure is investigated for the current-into-plane device. Cooperative tunneling (cotunneling) through several Fe nanoparticles is suggested to be operative at temperatures lower than 20 K. By considering the effect of cotunneling on the magnetoresistance ratio, it is successfully shown that the spin polarization of tunneling electrons generated at the Fe/C 60 interface is much higher than that in Fe crystal at low temperature in a similar fashion to that at the Co/C60 interface in the Co-doped C60 films. A strong temperature dependence of spin polarization is observed, suggesting a possible influence by the thermally induced disorders ascribed to the Fe atoms bonded with C60 in the C60 Fe compound.

KW - Fullerene

KW - Magnetic metal

KW - Spin polarization

KW - Spinterfaces

KW - TMR effect

UR - http://www.scopus.com/inward/record.url?scp=84884280219&partnerID=8YFLogxK

U2 - 10.1016/j.synthmet.2012.10.027

DO - 10.1016/j.synthmet.2012.10.027

M3 - Article

AN - SCOPUS:84884280219

SN - 0379-6779

VL - 173

SP - 22

EP - 25

JO - Synthetic Metals

JF - Synthetic Metals

ER -

High spin polarization at the Fe/C₆₀ interface in the Fe-doped C₆₀ film

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Keywords

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