Magnetization reversal process in FePt nanoparticles

Author

Okamoto, S.

Author_Institution

Inst. of Multidisciplinary Res. for Adv. Mater., Tohoku Univ., Sendai, Japan

fYear

2005

fDate

4-8 April 2005

Firstpage

1919

Lastpage

1920

Abstract

In this study, the anomalous Hall effect (AHE) of a lithographically fabricated single FePt [001] nanodot and epitaxially grown FePt [001] nanoparticle arrays is measured and their magnetization reversal processes are discussed. Results show that the magnetization reversal for the nanodots initiated by the nucleation of a small reversed embryo with exchange length scale. As for the nanoparticle arrays, a change of reversal mode from coherent to incoherent rotation is observed and it is concluded that the critical size for coherent rotation in the nanoparticles is about 20 nm.

Keywords

Hall effect; epitaxial growth; ferromagnetic materials; iron alloys; lithography; magnetic particles; magnetisation reversal; nanoparticles; nucleation; platinum alloys; FePt; anomalous Hall effect; critical size; epitaxially-grown nanoparticle arrays; exchange length scale; incoherent rotation; lithographically-fabricated single nanodot; magnetization reversal; small reversed embryo nucleation; Anisotropic magnetoresistance; Atomic force microscopy; Hall effect; Lithography; Magnetic anisotropy; Magnetic films; Magnetic materials; Magnetic recording; Magnetization reversal; Nanoparticles;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464394

Filename

1464394