Magnetic transport properties in epitaxial Fe3O4 thin film

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Magnetic transport properties in epitaxial Fe3O4 thin film Chunrui Hu Yizheng Wu Surface Physics Laboratory ,Department of Physics, Fudan University Introduction： Field dependence of MR% at different temperatures Fe3O4 is one of the important 3d transition-metal oxides, high Curie temperature (858 K), presence of a metal-insulator transition MIT at around 120 K (Verwey transition),and spin polarization rate reaching 100% in theory. Therefore, Fe3O4 is expected to exhibit suitable properties for its implementation in spintronic devices. Magnetoresistance reach maximum round at 110k, nearly 11%. Experiment： XRD MgO(002) Fe3O4(004) MBE RT Hall effect RT Phall effect Fe3O4 MgO(001) RHEED The 004 reflection from the Fe3O4 film is shown. Laue Oscillations indicate a very high crystalline coherence ,which also can be gained from RHEED pattern. Phall resistivity： ρxy=(ρ||-ρ┴)sinθcosθ fit θ， torque: H*sin(α-θ), α: H۷I, θ : M۷I. No pinnacle is observed in easy axis; pinnacle in hard axis may be produced by Phall effect . Resistivity as a function of temperature A substantial increase of the resistivity at the Verwey transition occurs at TV ~112 K. Hsin(α- θ) = (1/2)Hk1sin2θ - (1/4)Hk2sin 4θ Fitting: <100> Hk1=-11.0319 Oe，Hk2=-286.4634 Oe; <110> Hk1=22.1251 Oe, Hk2=-263.5418 Oe. Hall resistivity as a function of resistivity Curve fit：σxy~σxx1.66， the origin of this scaling is an open issue at present. conclusion：（1）The epitaxial films of high crystal quality are gained by Molecular Beam Epitaxy. （2） Magnetoresistance reach maximum round at 110k. （3） Pinnacle in hard axis may be produced by Phall effect.