Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


Advanced Magnetic Materials

J. Korean Phy. Soc. 2006; 49(3): 1016

Published online September 15, 2006

Copyright © The Korean Physical Society.

Fabrication of Epitaxial fcc Co/Cu Nanostructures/Si(001)

H. M. Hwang, S. W. Shin, J. H. Kang, J. Lee, J. H. Lee, J. H. Song, J.-Y. Choi, H. H. Lee and H. S. Lee


Isolated epitaxial Co(5 nm $leq$ t$_{Co}$ $leq$ 30 nm)/Cu nanostructures have been fabricated on a Si(001) substrate by using a nanoporous anodic aluminum-oxide (AAO) film as a mask during evaporation. The structural and the magnetic properties of the nanostructures are compared with those of as-grown films. The results of X-ray diffraction confirm that both the film and the nanostructure have a fcc structure with a (001) surface and a Co[110]//Cu[110]//Si[001] crystallographic relation in the plane. The nanostructures with t$_{Co}$ $geq$ 10 nm show clear four-fold symmetry of the remanent magnetization in the plane, but due to dipole interactions among nanodots, their values are smaller than those of films. The nanostructure with t$_{Co}$ = 5 nm shows isotropic hysteresis loops while the film with the same thickness shows a four-fold symmetry.