Magnetization reversal process in FePt L10 nanoparticles

S. Okamoto; N. Kikuchi; O. Kitakami; Y. Shimada

doi:10.1016/j.scriptamat.2005.04.034

Magnetization reversal process in FePt L1₀ nanoparticles

S. Okamoto, N. Kikuchi, O. Kitakami, Y. Shimada

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

11 Citations (Scopus)

Abstract

We have studied the magnetization reversals of FePt L1₀ particles. Lithographically fabricated single FePt particles and well isolated epitaxial FePt L1₀ nanoparticles have been investigated for a wide range of particle diameters D. Careful analyses of the experiments have revealed that for particles larger than 20 nm the magnetization reversal behaviors are governed by either nucleation or expansion of a reversed domain depending on the temperature, and the coherent rotation mode becomes dominant for D < 20 nm.

Original language	English
Pages (from-to)	395-401
Number of pages	7
Journal	Scripta Materialia
Volume	53
Issue number	4
DOIs	https://doi.org/10.1016/j.scriptamat.2005.04.034
Publication status	Published - 2005 Aug
Externally published	Yes

Keywords

Iron alloys
Magnetic anisotropy
Magnetic recording
Magnetic thin films
Platinum-group

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Access to Document

10.1016/j.scriptamat.2005.04.034

Cite this

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title = "Magnetization reversal process in FePt L10 nanoparticles",

abstract = "We have studied the magnetization reversals of FePt L10 particles. Lithographically fabricated single FePt particles and well isolated epitaxial FePt L10 nanoparticles have been investigated for a wide range of particle diameters D. Careful analyses of the experiments have revealed that for particles larger than 20 nm the magnetization reversal behaviors are governed by either nucleation or expansion of a reversed domain depending on the temperature, and the coherent rotation mode becomes dominant for D < 20 nm.",

keywords = "Iron alloys, Magnetic anisotropy, Magnetic recording, Magnetic thin films, Platinum-group",

author = "S. Okamoto and N. Kikuchi and O. Kitakami and Y. Shimada",

note = "Funding Information: The authors wish to thank Prof. K. Fukamichi of Tohoku University for operation of EB lithography, and Dr. Y.K. Takahashi and Dr. K. Hono of National Institute for Materials Science for TEM observations. This work has been supported by Industrial Technology Research Grant Program in 02 from NEDO of Japan, the Grant-in-Aid of the Japan Society for the Promotion of Science, the Special Coordination Funds for Promoting Science and Technology on “Nanohetero Metallic Materials” from the Ministry of Education, Culture, Sport, Science and Technology (MEXT), the IT-program RR2002 of MEXT, and the Storage Research Consortium in Japan.",

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AU - Okamoto, S.

AU - Kikuchi, N.

AU - Kitakami, O.

AU - Shimada, Y.

N1 - Funding Information: The authors wish to thank Prof. K. Fukamichi of Tohoku University for operation of EB lithography, and Dr. Y.K. Takahashi and Dr. K. Hono of National Institute for Materials Science for TEM observations. This work has been supported by Industrial Technology Research Grant Program in 02 from NEDO of Japan, the Grant-in-Aid of the Japan Society for the Promotion of Science, the Special Coordination Funds for Promoting Science and Technology on “Nanohetero Metallic Materials” from the Ministry of Education, Culture, Sport, Science and Technology (MEXT), the IT-program RR2002 of MEXT, and the Storage Research Consortium in Japan.

PY - 2005/8

Y1 - 2005/8

N2 - We have studied the magnetization reversals of FePt L10 particles. Lithographically fabricated single FePt particles and well isolated epitaxial FePt L10 nanoparticles have been investigated for a wide range of particle diameters D. Careful analyses of the experiments have revealed that for particles larger than 20 nm the magnetization reversal behaviors are governed by either nucleation or expansion of a reversed domain depending on the temperature, and the coherent rotation mode becomes dominant for D < 20 nm.

AB - We have studied the magnetization reversals of FePt L10 particles. Lithographically fabricated single FePt particles and well isolated epitaxial FePt L10 nanoparticles have been investigated for a wide range of particle diameters D. Careful analyses of the experiments have revealed that for particles larger than 20 nm the magnetization reversal behaviors are governed by either nucleation or expansion of a reversed domain depending on the temperature, and the coherent rotation mode becomes dominant for D < 20 nm.

KW - Iron alloys

KW - Magnetic anisotropy

KW - Magnetic recording

KW - Magnetic thin films

KW - Platinum-group

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