Development of nano waires from threading dislocations

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In this study, we aimed to develop a new functional materials using dislocations. To grow threading dislocations, NiO solid thin film was grown on SrTiO3 substrate by pulsed laser deposition (PLD) technique. A small lattice mismatch between NiO and SrTiO3 results in the formation of threading dislocations in NiO thin films. Generally, NiO is an anti-ferromagnetic material. However, it was found very unique magnetic properties could be obtained at the threading dislocations formed in NiO thin films grown on SrTiO3 substrate. By measuring with a magnetic force microscope, we confirmed ferromagnetic property can be obtained only at the threading dislocations. We concluded that appearance of the ferromagnetic property only at the threading dislocation core is due to a lattice structural change of NiO at the threading dislocation core. The result was published in Nature Materials.