Photo-Induced Precession of Magnetization in Metal/(Ga, Mn)As Systems

Author

Kobayashi, S. ; Suda, K. ; Aoyama, J. ; Nakahara, D. ; Munekata, H.

Author_Institution

Imaging Sci. & Eng. Lab., Tokyo Inst. of Technol., Yokohama, Japan

Volume

46

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

2470

Lastpage

2473

Abstract

Photo-induced precession of magnetization in (Ga, Mn)As was studied for samples having metal (Pt and Fe) overlayers on (Ga, Mn)As epilayers. It has been found, for both structures, that an increase in the thickness of metal layers results in the reduced effective magnetic field and enhanced Gilbert damping constant. It has been shown experimentally that direct contact between metals and (Ga, Mn)As is the necessary condition to cause the observed phenomena. Spin pumping effect may be the relevant mechanism, but overall behavior is not fully explainable with simple pictures.

Keywords

III-V semiconductors; gallium arsenide; iron; magnetic epitaxial layers; magnetic hysteresis; magnetic multilayers; magnetic semiconductors; manganese compounds; platinum; semiconductor epitaxial layers; spin dynamics; Fe-GaMnAs; Gilbert damping constant; Pt-GaMnAs; epilayers; magnetization; metal overlayer; photo-induced precession; spin pumping effect; Damping; Iron; Magnetic materials; Magnetization; Manganese; Nonlinear optics; Optical pulses; Optical pumping; Transmission electron microscopy; Ultrafast optics; Ferromagnetic materials; interface phenomena; magnetic semiconductors; manganese compounds; optical Kerr effect; ultrafast optics;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

Conference_Location

6/1/2010 12:00:00 AM

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2010.2042289

Filename

5467682