Thermoreflection measurement of magnetic thin films

Author

Yang, Hang Zhou ; Leong, S.H. ; An, C.W. ; Chen, Y.J. ; Ye, K.D. ; Ng, L.T. ; Zhang, Juyong ; Ng, Kang Kee ; Hu, Jiang Feng

Author_Institution

Data Storage Inst., A-star, Singapore, Singapore

fYear

2012

fDate

Oct. 31 2012-Nov. 2 2012

Firstpage

1

Lastpage

2

Abstract

With recent developments in Heat Assisted Magnetic Recording (HAMR), there is growing intense interest in the thermal-optical properties of the HAMR media. We detect the phase change of the optical beam as it reflects from a FePt thin film under strong thermal gradient by carrying out Close-Aperture reflection Z-scan experiments. It was found that the far field spatial distribution of the reflected beam is sensitive and dependent on the thermal field distribution in the media. This experiment technique can be extended to study the spatial distribution of the thermal field in the HAMR media and to enable temperature measurement of HAMR media under laser irradiation.

Keywords

iron alloys; laser beam applications; magnetic recording; magnetic thin films; metallic thin films; platinum alloys; thermoreflectance; FePt; close-aperture reflection Z-scan; far field spatial distribution; heat assisted magnetic recording; laser irradiation; magnetic thin films; optical beam; thermal field distribution; thermal gradient; thermal-optical properties; thermoreflection; Magnetic films; Magnetic properties; Measurement by laser beam; Media; Optical films; Optical reflection; Optical variables measurement; HAMR; Z-scan; magnetic thin film; thermal field distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

APMRC, 2012 Digest

Conference_Location

Singapore

Print_ISBN

978-1-4673-4734-1

Type

conf

Filename

6407362