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The effect of swift heavy ion (SHI) irradiation (190MeVAg) on structural, electrical transport and magnetic properties of epitaxial magnetite (Fe3O4) thin films (thickness ∼70nm) grown on MgO⟨100⟩ oriented substrate have been investigated. The x-ray diffraction shows that at low fluence values up to 5×1011ions∕cm2, the strain in the films is relaxed, whereas, at higher fluence range 1×1012–1×1013ions∕cm2, the epitaxial relationship with the substrate is lost along with a phase transformation from magnetite to more oxidized magnetite phase (i.e., maghemite). The Verwey transition temperature measured by electrical transport is found to increase from 109 to 117K with the low fluence SHI irradiation, which is related to the irradiation induced strain relaxation and structural modifications. At higher fluences the system did not show Verwey transition and the resistance is also increased. The similar results were obtained by magnetization studies. The observed magnetization at 1T field is increased at low flu...

Swift heavy ion irradiation-induced modifications in structural, magnetic and electrical transport properties of epitaxial magnetite thin films