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Magnetic properties of ultrathin single crystal Fe3O4 film on InAs(100) by ferromagnetic resonance

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JournalJournal of Applied Physics
DatePublished - 1 Apr 2012
Issue number7
Original languageEnglish


The evolution of both in-plane and out-of-plane magnetic anisotropies has been studied on different thicknesses of Fe3O4/InAs(100) hybrid spintronic structures by ferromagnetic resonance. The uniaxial magnetic anisotropy with easy axis along InAs [011] direction and hard axis along [0-11] direction and the cubic magnetic anisotropy are determined by fitting the resonance field. The cubic magnetic anisotropy constant K-1 is negative, as that of bulk magnetite, and its absolute value increases rapidly from 0.2 x 10(4) erg/cm(3) to 10.8 x 10(4) erg/cm(3) with increasing thickness of Fe3O4 film. When the thickness of Fe3O4 film is only several monolayers (t(Fe) = 6 nm), a bulk-like cubic magneto-crystalline anisotropy is built up. The uniaxial anisotropy constant is much smaller than that in Fe3O4/GaAs film with the same thickness of Fe3O4 film, as expected from the less lattice mismatch at the interface. (C) 2012 American Institute of Physics. [doi:10.1063/1.3677673]

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