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)

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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Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films : scattering by spin waves and kondo like behavior. / Nakamura, Shintaro ; Nojima, Tsutomu; Yoshihara, Akira; Ohnuma, Shigehiro; Fujimori, Hiroyasu.

In: Journal of the Physical Society of Japan, Vol. 78, No. 7, 074708, 01.07.2009.

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

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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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