Abstract
Polycrystalline Fe3O4 films have been prepared by reactive sputtering at room temperature.A transmission electron microscope image shows that the films consist ofFe3O4 grains well separated by grain boundaries with long-range and atomic scale disorders. Thewidth of the long-range disordered grain boundaries observed by high resolutiontransmission electron microscopy is about , which is consistent with the boundary dimension derived from the resistivityand magnetization measurements. The temperature dependence of resistivityindicates that the transport properties of the films are dominated by themechanism of fluctuation-induced tunnelling of electrons across the grainboundaries. Ordinary and extraordinary Hall constants were measured to be−8.22 × 10−11 and , which are two and three orders of magnitude larger than those of iron, respectively.
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