Structural and magnetic properties of epitaxially grown Fe{endash}Sm and Fe{endash}Sm{endash}N films

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365518· OSTI ID:496514

Jang, P W; Wang, D; Doyle, W D ^[1]

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1. Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209 (United States)

Thin Fe{endash}Sm{endash}N films with thickness {ge}50 nm and coercivities {ge}4 kOe were grown on an {alpha}-Ta (110) substrate by dc magnetron sputtering. Transmission electron microscopy diffraction data clearly showed that the films were polycrystalline with the ThMn{sub 12} tetragonal structure and with a preferential orientation of (011) Fe{endash}Sm//(110) Ta. This resulted in a uniform distribution of the easy axis on a cone of 29{degree} to the film normal. The structural data were also supported by the hysteresis loops measured as a function of angle in plane and out of plane. The high coercivity phase was obtained from targets with 15{endash}20 at.{percent} Sm. For the 10 at.{percent} Sm target, only a soft {alpha}-Fe phase was formed. For films of {lt}50 nm sputtered from 15 to 20 at.{percent} Sm, a soft phase was clearly observed in the vibrating sample magnetometer and was the only soft phase formed in 10 nm thick films. However, films of {gt}50 nm thickness showed high coercivities without a kink in the demagnetization loops and seemed to be composed only of magnetically hard phase, which was probably due to strong magnetic interactions between magnetically soft and hard phases at the Fe{endash}Sm/Ta interface. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496514
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COERCIVE FORCE
CRYSTAL STRUCTURE
DEMAGNETIZATION
EPITAXY
HYSTERESIS
IRON ALLOYS
MAGNETIC PROPERTIES
NITRIDES
PERMANENT MAGNETS
SAMARIUM ALLOYS
SPUTTERING
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY