Study on magnetic anisotropy in single crystalline Fe3O4/Au hetero-structures
Pure spin current devices based on magnetic/heavy metal hetero-structures lie in the core of spintronics due to their advantages of non-volatility and low power consumption.Here the static and dynamic magnetic properties of magnetic/heavy metal hetero-structure of Fe3O4/Au epitaxial thin films prepared by molecular beam epitaxy were systematically investigated by superconducting quantum interference device and ferromagnetic resonance measurements.It has been found that the uniaxial magnetic anisotropy decreases while the cubic magnetocrystalline anisotropy increases with the thickness of the Fe3O4 epitaxial thin films.Moreover,the introduce of heavy metal Au capping layer significantly increases both the uniaxial and cubic magnetic anisotropy in the Fe3O4 films,which may be ascribed to the relaxation of Fe3O4 lattice due to the capping of Au lattice.Therefore,the present work offers an alternative strategy for the fabrication of magnetic/heavy metal hetero-structures,which may promote the practical application of the pure spin current devices in spintronics.
single crystalline Fe3 O4magnetic/heavy metal hetero-structuresmagnetic anisotropyferromagnetic resonancemagnetization dynamics
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