Nonlinear strain dependence of magnetic anisotropy in CoFe{sub 2}O{sub 4} films on MgO(001) substrates

Journal Article · Wed May 07 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4853235· OSTI ID:22273948

Harada, K.; Takemura, M.; Mibu, K. ^[1]; Inoue, J. ^[2]

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1. Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Nagoya, Aichi 466-8555 (Japan)
2. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006 (Japan)

CoFe{sub 2}O{sub 4} films were deposited on MgO(001) substrates using pulsed laser deposition with various laser energy densities. We found that the CoFe{sub 2}O{sub 4} films were grown in the (001) orientation and that the lattice constant of the CoFe{sub 2}O{sub 4} films was dependent on the laser energy densities. Perpendicular magnetic anisotropy (PMA) was observed, but the lattice strain dependence was not consistent with the phenomenological model in which the PMA is in proportion to the lattice strain. The lattice strain dependence of PMA was compared with an electron theory in which the spin-orbit interaction and the tetragonal crystal field in the electronic state of a single Co ion are considered. The experimental result does not contradict with the calculation, which shows that the magnetic anisotropy is not proportional to the lattice strain and asymmetric in respect to negative and positive lattice strain.

• OSTI ID: 22273948
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
COBALT IONS
COBALT OXIDES
COMPARATIVE EVALUATIONS
CRYSTAL FIELD
CRYSTAL STRUCTURE
ELECTRONS
ENERGY BEAM DEPOSITION
ENERGY DENSITY
FERRITES
L-S COUPLING
LASER RADIATION
LATTICE PARAMETERS
MAGNESIUM OXIDES
NONLINEAR PROBLEMS
PULSED IRRADIATION
STRAINS
SUBSTRATES
THIN FILMS