Magnetic and Magnetotransport Properties in Nanogranular Co/C60-Co Film with High Magnetoresistance

Seiji Sakai; Kay Yakushiji; Seiji Mitani; Isamu Sugai; Koki Takanashi; Hiroshi Naramoto; Pavel V. Avramov; Vasily Lavrentiev; Kazumasa Narumi; Yoshihito Maeda

doi:10.2320/matertrans.48.754

Magnetic and Magnetotransport Properties in Nanogranular Co/C₆₀-Co Film with High Magnetoresistance

Seiji Sakai, Kay Yakushiji, Seiji Mitani, Isamu Sugai, Koki Takanashi, Hiroshi Naramoto, Pavel V. Avramov, Vasily Lavrentiev, Kazumasa Narumi, Yoshihito Maeda

Author information

Seiji Sakai
Advanced Science Research Center, Japan Atomic Energy Agency
Kay Yakushiji
Institute for Materials Research, Tohoku University
Seiji Mitani
Institute for Materials Research, Tohoku University
Isamu Sugai
Advanced Science Research Center, Japan Atomic Energy Agency
Institute for Materials Research, Tohoku University
Koki Takanashi
Institute for Materials Research, Tohoku University
Hiroshi Naramoto
Advanced Science Research Center, Japan Atomic Energy Agency
Pavel V. Avramov
Advanced Science Research Center, Japan Atomic Energy Agency
Vasily Lavrentiev
Advanced Science Research Center, Japan Atomic Energy Agency
Kazumasa Narumi
Advanced Science Research Center, Japan Atomic Energy Agency
Yoshihito Maeda
Advanced Science Research Center, Japan Atomic Energy Agency
Department of Energy Science and Technology, Kyoto University

Keywords: C₆₀-Co compound, Co nanoparticle, nanogranular film, tunnel magnetoresistance, magnetic property, Raman analysis, bias voltage dependence

JOURNAL FREE ACCESS

2007 Volume 48 Issue 4 Pages 754-758

DOI https://doi.org/10.2320/matertrans.48.754

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Abstract

Magnetic properties were investigated for the alternately deposited film of C₆₀ and Co which has found to exhibit tunnel magnetoresistance (MR) of 10–80%. Magnetic field and temperature dependences of magnetization showed typical superparamagnetic behaviors with the blocking temperature of 40 K. The magnetization curve at 300 K was well fitted by the Langevin function with the size distribution of Co particles, and the mean diameter and size distribution were evaluated to be 3.1 nm and ∼1 nm, respectively. Based on the magnetic properties, the structure and magnetotransport properties are discussed in details.

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