Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films: scattering by spin waves and kondo like behavior

Shintaro Nakamura; Tsutomu Nojima; Akira Yoshihara; Shigehiro Ohnuma; Hiroyasu Fujimori

doi:10.1143/JPSJ.78.074708

Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films: scattering by spin waves and kondo like behavior

Shintaro Nakamura, Tsutomu Nojima, Akira Yoshihara, Shigehiro Ohnuma, Hiroyasu Fujimori

Institute for Materials Research (IMR) (institute affiliation only)

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

6 Citations (Scopus)

Abstract

We investigate the electrical resistivity of the ferromagnetic granular thin films TM-Al-O (TM = Fe, Co). The resistivity shows T ²behavior at low temperatures in all metallic samples. This strongly suggests scattering of conduction electrons by thermally excited ferromagnetic spin waves. Logarithmic Kondo like behavior (mdashlog T) in the resistivity and negative magnetoresistivity at low temperatures are observed. With decreasing concentration of transition metal, both the coefficients of the T ²and log T terms increase.

Original language	English
Article number	074708
Journal	Journal of the Physical Society of Japan
Volume	78
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.78.074708
Publication status	Published - 2009 Jul 1

Keywords

Co-Al-O
Electrical resistivity
Fe-Al-O
Ferromagnetic order
Granular film
Kondo like behavior
Magnetoresistivity
Magnon scattering
Spin wave
Transition metal

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.78.074708

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title = "Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films: scattering by spin waves and kondo like behavior",

abstract = "We investigate the electrical resistivity of the ferromagnetic granular thin films TM-Al-O (TM = Fe, Co). The resistivity shows T 2behavior at low temperatures in all metallic samples. This strongly suggests scattering of conduction electrons by thermally excited ferromagnetic spin waves. Logarithmic Kondo like behavior (mdashlog T) in the resistivity and negative magnetoresistivity at low temperatures are observed. With decreasing concentration of transition metal, both the coefficients of the T 2and log T terms increase.",

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T1 - Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films

T2 - scattering by spin waves and kondo like behavior

AU - Nakamura, Shintaro

AU - Nojima, Tsutomu

AU - Yoshihara, Akira

AU - Ohnuma, Shigehiro

AU - Fujimori, Hiroyasu

PY - 2009/7/1

Y1 - 2009/7/1

N2 - We investigate the electrical resistivity of the ferromagnetic granular thin films TM-Al-O (TM = Fe, Co). The resistivity shows T 2behavior at low temperatures in all metallic samples. This strongly suggests scattering of conduction electrons by thermally excited ferromagnetic spin waves. Logarithmic Kondo like behavior (mdashlog T) in the resistivity and negative magnetoresistivity at low temperatures are observed. With decreasing concentration of transition metal, both the coefficients of the T 2and log T terms increase.

AB - We investigate the electrical resistivity of the ferromagnetic granular thin films TM-Al-O (TM = Fe, Co). The resistivity shows T 2behavior at low temperatures in all metallic samples. This strongly suggests scattering of conduction electrons by thermally excited ferromagnetic spin waves. Logarithmic Kondo like behavior (mdashlog T) in the resistivity and negative magnetoresistivity at low temperatures are observed. With decreasing concentration of transition metal, both the coefficients of the T 2and log T terms increase.

KW - Co-Al-O

KW - Electrical resistivity

KW - Fe-Al-O

KW - Ferromagnetic order

KW - Granular film

KW - Kondo like behavior

KW - Magnetoresistivity

KW - Magnon scattering

KW - Spin wave

KW - Transition metal

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Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films: scattering by spin waves and kondo like behavior

Abstract

Keywords

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