Ultrathin Co films on Pt(111) and the Co-Pt interface investigated by surface magneto-optical Kerr effect and medium-energy ion scattering spectroscopy

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Magnetic anisotropy evolution of ultrathin Co films grown on a Pt(111) single-crystal surface is investigated by a UHV in situ surface magneto-optical Kerr effect (SMOKE) measurement. Perpendicular magnetic anisotropy in ultrathin Co films is found to be persistent up to a thickness of 12 ML where the easy magnetization axis changes its orientation to an in-plane direction. The interface structure of an ultrathin Co overlayer on Pt(111) was investigated with atomic-layer resolution medium-energy ion scattering spectroscopy. For 7-ML Co, interdiffusion begins at 673 K to form a heavily distorted Co-Pt surface alloy layer with little change in SMOKE intensity. However, annealing at 773 K formed a 30-atomic-layers thick Co-Pt substitutional alloy with tensile strain, at which the SMOKE intensity increased by more than 200%. The enhancement of the Kerr intensity is discussed with the interface alloy formation.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2002-03
Language
English
Article Type
Article
Keywords

SPIN REORIENTATION TRANSITION; VACUUM IN-SITU; COBALT FILMS; THIN-FILMS; CO/PT(111); GROWTH; ANISOTROPY; PD(111); STRAIN; ALLOY

Citation

PHYSICAL REVIEW B, v.65, no.10

ISSN
1098-0121
URI
http://hdl.handle.net/10203/14068
Appears in Collection
RIMS Journal Papers
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