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Self-Assembled Magnetic Dots, Antidots, Dot Chains, and Stripes: Epitaxial Co on Ru(0001) (INVITED)

Published online by Cambridge University Press:  17 March 2011

Dongqi Li  and
Chengtao Yu
Dongqi Li
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
Chengtao Yu
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

We have observe a metal-on-metal growth mode in Co/Ru(0001) at elevated temperature, where self-assembled 3D dots and antidots in rather regular truncated pyramidal shapes are mainly attributed to a stress-driven mechanism. While good lattice match has been one of the major criteria to guide epitaxial growth, it is possible that well-chosen lattice mismatched systems could be utilized to fabricate strain-engineered regular magnetic nanostructure arrays with different sizes and periodicity. A linear alignment of self-assembled Co dots and stripes can be created along grooves on a Ru(0001) substrate. Our observations suggest that it may be possible to direct the alignment and positioning in self-assembly of complex patterns by means of substrate templating, which should be of general applicability beyond the Co/Ru system. Magnetically, the dots are ferromagnetic with in-plane single-domain state, while the thick films with antidots exhibit perpendicular stripe domains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 696: Symposium N – Current Issues in Heteroepitaxial Growth--Stress Relaxation and Self Assembly , 2001 , N9.1
Copyright
Copyright © Materials Research Society 2002

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