Spin-orbit interaction tuning of perpendicular magnetic anisotropy in L1{sub 0} FePdPt films

Journal Article · Mon May 12 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4876128· OSTI ID:22273428

Ma, X.; He, P.; Ma, L.; Zhou, S. M. ^[1]

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1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092 (China)

The dependence of perpendicular magnetic anisotropy K{sub u} on spin-orbit coupling strength ξ is investigated in L1{sub 0} ordered FePd{sub 1−x}Pt{sub x} films by time-resolved magneto-optical Kerr effect measurements and ab initio density functional calculations. Continuous tuning of K{sub u} over a wide range of magnitude is realized by changing the Pt/Pd concentration ratio, which strongly modifies ξ but keeps other leading parameters affecting K{sub u} nearly unchanged. Ab initio calculations predict a nearly quadratic dependence of K{sub u} on ξ, consistent with experimental data. K{sub u} increases with increasing chemical order and decreasing thermal spin fluctuations, which becomes more significant for samples with higher Pt concentration. The results demonstrate an effective method to tune K{sub u} utilizing its sensitivity on ξ, which will help fabricate magnetic systems with desirable magnetic anisotropy.

• OSTI ID: 22273428
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CONCENTRATION RATIO
DENSITY FUNCTIONAL METHOD
FLUCTUATIONS
IRON
KERR EFFECT
L-S COUPLING
PALLADIUM
PLATINUM
SPIN
THIN FILMS
TIME RESOLUTION
TUNING