Microwave-Assisted Magnetization Reversal of Exchange-Coupled Composite Nanopillar With Large Gilbert Damping Constant

Author

Tanaka, T. ; Kashiwagi, Shuta ; Otsuka, Yuichiro ; Nozaki, Y. ; Yang-Ki Hong ; Matsuyama, Kimihide

Author_Institution

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

Volume

50

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

3

Abstract

Microwave-assisted magnetization reversal (MAMR) characteristics of a single-exchange-coupled composite nanopillar, which consists of ferromagnetically coupled soft and hard magnetic sections, have been discussed in terms of Gilbert damping constant using micromagnetic simulation. The results indicate the occurrence of significant MAMR even when the damping constant of the hard magnetic section is large. The results obtained in this paper greatly contrast those obtained with single-phase hard magnetic pillars. We also found that the magnetization switching time tends to be shorter when the damping constant of the hard magnetic section is large.

Keywords

exchange interactions (electron); ferromagnetism; magnetic switching; magnetisation reversal; micromagnetics; nanocomposites; nanomagnetics; permanent magnets; soft magnetic materials; Gilbert damping constant; ferromagnetically coupled soft magnetic sections; hard magnetic sections; magnetization switching time; micromagnetic simulation; microwave-assisted magnetization reversal; single-exchange-coupled composite nanopillar; Damping; Magnetic resonance; Magnetization; Magnetomechanical effects; Perpendicular magnetic anisotropy; Soft magnetic materials; Exchange-coupled composite (ECC) structure; Landau??Lifshitz??Gilbert equation; ferromagnetic resonance; microwave-assisted magnetization reversal (MAMR);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2297156

Filename

6832785