Rotational magnetic anisotropy in polycrystalline FePt films fabricated by solid-state synthesis

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S1063783418010298· OSTI ID:22771492

Myagkov, V. G.; Bykova, L. E. ^[1]; Bondarenko, G. N. ^[2]; Velikanov, D. A.; Volochaev, M. N. ^[1]

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1. Russian Academy of Sciences, Kirensky Institute of Physics, Federal Research Center KSC SB RAS (Russian Federation)
2. Russian Academy of Sciences, Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS (Russian Federation)

It is shown that annealing 550°C of the Fe/Pt bilayer films fabricated by layer-by-layer deposition onto polycrystalline Al{sub 2}O{sub 3} substrates in an atomic ratio of Fe: Pt = 71: 29 leads to the formation of the inplane rotational magnetic anisotropy with the easy axis that can be aligned by magnetic field in any direction in the film plane. The increase in the Pt content in the investigated film system to 50 at % leads to an increase in the anisotropy constant to 6.5 × 10{sup 6} erg/cm{sup 3}, which exceeds the value in the Fe{sub 71}Pt{sub 29} sample by a factor of 6. In addition to the rotational anisotropy, the Fe50Pt50 films are characterized by the perpendicular rotational magnetic anisotropy, which is higher than the film shape anisotropy. Therefore, the easy axis in these samples can be aligned by magnetic field in any spatial direction. According to the X-ray and magnetic measurement data, the synthesized samples have a polycrystalline structure consisting of two ordered phases: magnetically hard L1{sub 0}–FePt and magnetically soft L1{sub 2}–Fe{sub 3}Pt. This gives us grounds to suggest that the rotational magnetic anisotropy originates from the epitaxial intergrowth and exchange coupling of these two phases.

• OSTI ID: 22771492
• Journal Information: Physics of the Solid State, Vol. 60, Issue 1; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM OXIDES
ANISOTROPY
ANNEALING
BINARY ALLOY SYSTEMS
CONCENTRATION RATIO
DEPOSITION
EPITAXY
FILMS
IRON COMPOUNDS
LAYERS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
PHASE TRANSFORMATIONS
PLATINUM COMPOUNDS
POLYCRYSTALS
SOLIDS
SUBSTRATES
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
X RADIATION