Growth-induced magnetic anisotropy and clustering in vapor-deposited Co-Pt alloy films

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.12826· OSTI ID:698843

Shapiro, A L; Rooney, P W; Tran, M Q; Hellman, F ^[1]; Ring, K M; Kavanagh, K L ^[2]; Rellinghaus, B; Weller, D ^[3]

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1. Department of Physics, University of California--San Diego, La Jolla, California 92093 (United States)
2. Department of Electrical and Computer Engineering, University of California--San Diego, La Jolla, California 92093 (United States)
3. IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120 (United States)

Polycrystalline and epitaxial (100)-, (110)-, and (111)-oriented CoPt{sub 3} and Co{sub 0.35}Pt{sub 0.65} films were deposited at various growth rates and over a range of growth temperatures from {minus}50 to 800&hthinsp;{degree}C. Films grown at moderate temperatures (200{endash}400&hthinsp;{degree}C) exhibit remarkable growth-induced properties: perpendicular magnetic anisotropy and large coercivity, as well as enhanced Curie temperature and low-temperature saturation magnetization. Magnetic measurements indicate significant Co clustering in these epitaxial fcc films. These properties are independent of crystallographic orientation, increase with increasing growth temperature, and vanish with annealing. We propose that the correlation between magnetic inhomogeneity, magnetic anisotropy, and enhanced moment is explained by clustering of Co into thin platelets in a Pt-rich lattice. This clustering occurs at the growth surface and is trapped into the growing film by low bulk atomic mobility. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 698843
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 60; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ATOMIC CLUSTERS
COBALT ALLOYS
COERCIVE FORCE
CURIE POINT
FCC LATTICES
FERROMAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
PLATINUM ALLOYS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THIN FILMS
VAPOR DEPOSITED COATINGS
VAPOR PHASE EPITAXY