The A1 to L1{sub 0} transformation in FePt films with ternary alloying additions of Mg, V, Mn, and B

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3559482· OSTI ID:21560107

Wang, B; Barmak, K ^[1]; Klemmer, T J ^[2]

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1. Department of Materials Science and Engineering and the Data Storage Systems Center, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213 (United States)
2. Seagate Media Research, 47010 Kato Road, Fremont, California 94538 (United States)

The impact of ternary additions of Mg, V, Mn, and B on the A1 [face centered cubic (fcc)] to L1{sub 0} phase transformation has been studied. The films were cosputter deposited from elemental targets at room temperature and annealed after deposition. The films had Mg additions in the range {approx}0-2.6 at.%, V additions in the range 0.7-12.2 at.%, Mn additions in the range 2.2-16.3 at.%, and B additions in the range 1.2-12.9 at.%. For all four ternary alloy systems, annealing resulted in the formation of no other phases than the L1{sub 0} phase. Ternary additions of <1.8 at.% Mg, <5.8 at.% V, <6.0 at.% Mn, and <4.8 at.% B had little or no impact on the kinetic ordering temperature (KOT). The behavior of the activation energy for the transformation mirrored that for the KOT, except for Mg additions, which showed no measurable impact for the compositions studied. The transformation enthalpies for the ternary alloys were similar to those for binary FePt films. Only four of the films (with additions of 2.6 at.% Mg, 2.2 at.% and 6.0 at.% Mn, and 4.8 at.% B) for which the Curie transition was observed had lower T{sub C} than the binary FePt films with the same Pt content.

• OSTI ID: 21560107
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 7; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: DOI: 10.1063/1.3559482; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ANNEALING
BORON ALLOYS
DEPOSITION
ENTHALPY
FCC LATTICES
IRON ALLOYS
MAGNESIUM ALLOYS
MANGANESE ALLOYS
PHASE TRANSFORMATIONS
PLATINUM ALLOYS
SOLIDS
SPUTTERING
TEMPERATURE RANGE 0273-0400 K
TERNARY ALLOY SYSTEMS
THIN FILMS
TRANSFORMATIONS
VANADIUM ALLOYS
ALLOY SYSTEMS
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ENERGY
FILMS
HEAT TREATMENTS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT ALLOYS