Crystallography, morphology, and magnetic properties of Fe nanostructures on faceted {alpha}-Al{sub 2}O{sub 3} m plane

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1825629· OSTI ID:20664971

Oster, J; Kallmayer, M; Wiehl, L; Elmers, H J; Adrian, H; Porrati, F; Huth, M ^[1]

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1. Johannes Gutenberg-Universitaet Mainz, Institut fuer Physik, Staudinger Weg 7, Mainz, 55099 (Germany)

The properties of iron nanostructures prepared by shallow incidence molecular beam epitaxy on faceted {alpha}-Al{sub 2}O{sub 3} (1010) (m plane) are described. Depending on the angle of deposition with regard to the sapphire surface, the morphology of the structures reaches from pearl-necklet-like strung nanodrops to laced nanowires. Crystallographic measurements reveal at least four epitaxial close to (211)-oriented twins. Magnetization measurements performed at room temperature in a vibrating sample magnetometer and magneto-optical Kerr rotation measurements reveal an easy axis of magnetization close to the facet ridges. Still, the shape of the hysteresis loops depends strongly on the morphology of the samples. The magnetization reversal process can be described by the formation of a magnetic vortex structure.

• OSTI ID: 20664971
• Journal Information: Journal of Applied Physics, Vol. 97, Issue 1; Other Information: DOI: 10.1063/1.1825629; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CRYSTALLOGRAPHY
DEPOSITION
ELECTRON BEAMS
FERROMAGNETIC MATERIALS
HYSTERESIS
IRON
KERR EFFECT
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETO-OPTICAL EFFECTS
MOLECULAR BEAM EPITAXY
MORPHOLOGY
NANOSTRUCTURES
SAPPHIRE
SURFACES
TEMPERATURE RANGE 0273-0400 K
VIBRATING SAMPLE MAGNETOMETERS
WIRES