Micromagnetic Study of Microwave-Assisted Magnetization Reversals of Exchange-Coupled Composite Nanopillars

Author

Tanaka, Terumitsu ; Narita, Naoyuki ; Kato, Ayumu ; Nozaki, Yukio ; Hong, Yang-Ki ; Matsuyama, Kimihide

Author_Institution

Grad. Sch. of Inf. Sci. & Electr. Eng., Kyushu Univ., Fukuoka, Japan

Volume

49

Issue

1

fYear

2013

fDate

Jan. 2013

Firstpage

562

Lastpage

566

Abstract

Microwave-assisted magnetization reversals of exchange-coupled composite nanopillars were studied by micromagnetic simulation. Magnetization reversal occurred in one or two frequency regions associated with magnetic resonance arising from the soft magnetic section. Significant reductions in ac field strength and frequency, which are required for magnetization switching, were obtained in cases where there was a large interface exchange constant between the soft and hard sections. It was also found that the large saturation magnetization of the soft magnetic section tends to enhance magnetization switching.

Keywords

exchange interactions (electron); ferromagnetic resonance; interface magnetism; magnetic switching; magnetisation reversal; micromagnetics; nanocomposites; nanomagnetics; permanent magnets; soft magnetic materials; ac field strength; exchange-coupled composite nanopillars; hard magnetic section; interface exchange constant; magnetic resonance; magnetization switching; micromagnetic simulation; microwave-assisted magnetization reversals; saturation magnetization; soft magnetic section; Magnetic resonance; Magnetization; Perpendicular magnetic anisotropy; Saturation magnetization; Soft magnetic materials; Switches; Ferromagnetic resonance (FMR); magnetic recording; micromagnetic simulation; microwave-assisted magnetization reversal (MAMR);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2211030

Filename

6263300