Ferromagnetic Co-C nanodot arrays produced by direct interferometric laser annealing

Author

Zheng, M. ; Yu, M. ; Liu, Y. ; Skomski, R. ; Liou, S.H. ; Sellmyer, D.J. ; Petryakov, V.N. ; Verevkin, Yu.K. ; Polushkin, N.I. ; Salashchenko, N.N.

Author_Institution

Center for Mater. Res. & Anal., Nebraska Univ., Lincoln, NE, USA

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2070

Lastpage

2072

Abstract

Magnetic properties of Co-C nanodot arrays produced by direct interferometric laser annealing are investigated by magnetic force microscopy (MFM) and magnetization measurements. The dots are formed by locally annealing sputtered amorphous Co-C films in regions where the laser intensity is highest. As-sputtered Co-C films do not exhibit ferromagnetic order at room temperature, but MFM shows that the dots become magnetic upon annealing, possibly due to the agglomeration or phase separation of Co-rich clusters. The dots are embedded in either a paramagnetic or weakly magnetic matrix. The magnetic properties of the generated pattern can be changed by varying the laser power. The present results show that direct interferometric lithography may become a useful tool for fabricating future patterned magnetic nanostructures

Keywords

annealing; arrays; cobalt alloys; ferromagnetic materials; laser beam annealing; light interferometry; magnetic domains; magnetic force microscopy; magnetic particles; magnetic thin films; magnetisation; Co-C; Co-rich clusters; MFM; agglomeration; direct interferometric laser annealing; direct interferometric lithography; ferromagnetic Co-C nanodot arrays; laser power; locally annealing; magnetic force microscopy; magnetic properties; magnetization; paramagnetic matrix; patterned magnetic nanostructures; phase separation; room temperature; sputtered amorphous Co-C films; weakly magnetic matrix; Amorphous magnetic materials; Annealing; Force measurement; Magnetic films; Magnetic force microscopy; Magnetic forces; Magnetic properties; Magnetic separation; Magnetization; Optical arrays;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951056

Filename

951056