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The evolution of the magnetic anisotropy directions has been studied in a magnetite (Fe 3 O 4 ) thin film grown by infrared pulsed-laser deposition on SrTiO 3 (100):Nb substrate. The magnetic easy axes at room temperature are found along the in-plane 〈100〉 film directions, which means a rotation of the easy axis by 45° with respect to the directions typically reported for bulk magnetite and films grown on single-crystal substrates. Moreover, when undergoing the Verwey transition temperature, T V , the easy axis orientation evolves to the 〈110〉 film directions. This anomalous behavior has been demonstrated by measuring first the angular dependence of coercivity and remanence well above and below T V by high-resolution vectorial magneto-optical Kerr effect (v-MOKE). Ferromagnetic resonance (FMR) measurements have additionally proven a well-defined fourfold magnetic anisotropy induced during growth with confirmed easy axis directions along 〈100〉 for T &gt; T V and 〈110〉 for T &lt; T V . These results provide a clear proof of the possibility of tuning magnetic anisotropy in Fe 3 O 4 hin films by proper control on the growth parameters and substrate choice.

nanoscale

Evidence of anomalous switching of the in-plane magnetic easy axis with temperature in Fe3O4 film on SrTiO3:Nb by v-MOKE and ferromagnetic resonance