Growth of L1{sub 0}-ordered crystal in FePt and FePd thin films on MgO(001) substrate

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4960554· OSTI ID:22611439

Futamoto, Masaaki; Nakamura, Masahiro ^[1]; Ohtake, Mitsuru ^[1]; Inaba, Nobuyuki ^[2]; Shimotsu, Teruho ^[3]

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1. Faculty of Science and Engineering, Chuo University, Tokyo, 112-8551 (Japan)
2. Faculty of Engineering, Yamagata University, Yonezawa 992-8510 (Japan)
3. Hitachi Power Solutions, Hitachi-naka, 312-8507 (Japan)

Formation of L1{sub 0}-oredered structure from disordered A1 phase has been investigated for FePt and FePd films on MgO(001) substrates employing a two-step method consisting of low temperature deposition at 200 °C followed by high-temperature annealing at 600 °C. L1{sub 0}-(001) variant crystal with the c-axis perpendicular to the substrate grows preferentially in FePd films whereas L1{sub 0}-(100), (010) variants tend to be mixed with the L1{sub 0}-(001) variant in FePt films. The structure analysis by X-ray diffraction indicates that a difference in A1 lattice strain is the influential factor that determines the resulting L1{sub 0}-variant structure in ordered thin films. Misfit dislocations and anti-phase boundaries are observed in high-resolution transmission electron micrographs of 10 nm-thick Fe(Pt, Pd) film consisting of L1{sub 0}-(001) variants which are formed through atomic diffusion at 600 °C in a laterally strained FePt/PeFd epitaxial thin film. Based on the experimental results, a nucleation and growth model for explaining L1{sub 0}-variant formation is proposed, which suggests a possibility in tailoring the L1{sub 0} variant structure in ordered magnetic thin films by controlling the alloy composition, the layer structure, and the substrate material.

• OSTI ID: 22611439
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 8 Vol. 6; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
BINARY ALLOY SYSTEMS
CRYSTAL GROWTH
DEPOSITION
DIFFUSION
DISLOCATIONS
EPITAXY
IRON COMPOUNDS
LAYERS
MAGNESIUM OXIDES
PALLADIUM COMPOUNDS
PLATINUM COMPOUNDS
RESOLUTION
STRAINS
SUBSTRATES
THIN FILMS
X-RAY DIFFRACTION