Self-assembled epitaxial magnetic lateral structures on Ru : controlling the shape and placement.
We explore lithographic patterning and substrate orientation of single-crystal Ru substrates as the means to control shape, alignment, and magnetic anisotropy of epitaxial Co and Fe islands. The Co dots and stripes were grown at 350{sup o}C via molecular-beam epitaxy and characterized ex situ with atomic force microscopy, magnetic force microscopy, and the magneto-optic Kerr effect. For Co deposited onto a Ru(0001) pre-etched with deep 6x6{mu}m squares, Co islands decorate the edges of the patterns and exhibit in-plane magnetic domains with easy axis along the edges. Shallow patterns, however, do not result in preferential positioning of the dots. When the etched shallow lines are along the close-packed [101{bar 0}] direction, the islands tend to elongate along the induced steps, which introduces a magnetic easy axis along the line direction. In contrast to the quasihexagonal dots of Co on Ru(0001), Fe deposited on the twofold Ru(101{bar 1}) forms elongated islands of -100nm long and 20 nm wide.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 961456
- Report Number(s):
- ANL/MSD/JA-47972
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 18 ; May 2004 Vol. 69; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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