Magnetic ordering at the Verwey transition in bulk like Fe3O4 thin films
Magnetite (Fe3O4) is a predicted half-metallic (100% spin polarised) ferromagnet with a high Curie temperature of ~858 K. These properties make it well suited to use in spintronic applications such as magnetoresistance-based devices and spin injection into semiconductors. In bulk magnetite, the Verwey transition is a well-studied phenomenon although still debated. Thin film investigations have been hindered by the formation of growth defects and strain, leading to antiphase boundaries an altered magnetic properties. We have developed an optimised growth method for producing Fe3O4 thin films with bulk-like stoichiometry and properties. Consequently, this provides a unique opportunity to study the magnetization depth dependence through the transition. We also wish to locate magnetic interfacial properties and investigate them as a function of strain. The results will clarify the role of strain and different interface properties on the density of defects, such as anti phase boundaries, and point the route to device fabrication.
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BELL Gavin; C W Burrows; S. E. Glover; HASE Thomas; LAZAROV Vlado and SAERBECK Thomas. (2016). Magnetic ordering at the Verwey transition in bulk like Fe3O4 thin films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-203
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