Magnetic and magnetotransport properties in nanogranular Co/C 60-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/C ₆₀-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

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

9 Scopus citations

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.

Original language	English
Pages (from-to)	754-758
Number of pages	5
Journal	Materials Transactions
Volume	48
Issue number	4
DOIs	https://doi.org/10.2320/matertrans.48.754
State	Published - Apr 2007

Keywords

Bias voltage dependence
C-Co compound
Co nanoparticle
Magnetic property
Nanogranular film
Raman analysis
Tunnel magnetoresistance

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10.2320/matertrans.48.754

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title = "Magnetic and magnetotransport properties in nanogranular Co/C 60-Co film with high magnetoresistance",

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.",

keywords = "Bias voltage dependence, C-Co compound, Co nanoparticle, Magnetic property, Nanogranular film, Raman analysis, Tunnel magnetoresistance",

author = "Seiji Sakai and Kay Yakushiji and Seiji Mitani and Isamu Sugai and Koki Takanashi and Hiroshi Naramoto and Avramov, \{Pavel V.\} and Vasily Lavrentiev and Kazumasa Narumi and Yoshihito Maeda",

year = "2007",

month = apr,

doi = "10.2320/matertrans.48.754",

language = "English",

volume = "48",

pages = "754--758",

journal = "Materials Transactions",

issn = "1345-9678",

publisher = "Japan Institute of Metals (JIM)",

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TY - JOUR

T1 - Magnetic and magnetotransport properties in nanogranular Co/C 60-Co film with high magnetoresistance

AU - Sakai, Seiji

AU - Yakushiji, Kay

AU - Mitani, Seiji

AU - Sugai, Isamu

AU - Takanashi, Koki

AU - Naramoto, Hiroshi

AU - Avramov, Pavel V.

AU - Lavrentiev, Vasily

AU - Narumi, Kazumasa

AU - Maeda, Yoshihito

PY - 2007/4

Y1 - 2007/4

N2 - 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.

AB - 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.

KW - Bias voltage dependence

KW - C-Co compound

KW - Co nanoparticle

KW - Magnetic property

KW - Nanogranular film

KW - Raman analysis

KW - Tunnel magnetoresistance

UR - https://www.scopus.com/pages/publications/34249825175

U2 - 10.2320/matertrans.48.754

DO - 10.2320/matertrans.48.754

M3 - Article

AN - SCOPUS:34249825175

SN - 1345-9678

VL - 48

SP - 754

EP - 758

JO - Materials Transactions

JF - Materials Transactions

IS - 4

ER -

Magnetic and magnetotransport properties in nanogranular Co/C ₆₀-Co film with high magnetoresistance

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