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Ieda, Junichi; Yamane, Yuta; Oe, Junichiro*; Maekawa, Sadamichi
no journal, ,
In magnetic nanostructures, there is a correction to Faraday's law of induction. The effect, which is called as a spin-motive force, has been demonstrated in magnetic domain wall (DW) motion and an electron transport through magnetic nanoparticles. In such experiments, however, magnetization dynamics is driven by applied magnetic fields. Instead, by using a shaped magnetic nanostripe, the generation of spin-motive force without external driving forces has been proposed. We perform numerical calculations for the proposal. For a magnetic nanostripe designed to have two asymmetrical notches, a DW can be trapped at the notches lowering its surface energy. We apply a short pulse of a magnetic field for the DW to overcome the intermediate energy barrier between two notches. Then the DW is displaced automatically to the next notch discharging its magnetic energy via spin-motive force. We combine micromagnetic simulations and calculation of the spin-motive force to analyze this system.
-FeSi
) thin films by high-energy heavy ion irradiationSasase, Masato*; Okayasu, Satoru; Yamamoto, Hiroyuki
no journal, ,
-FeSi is an indirect transition type semiconductor. It can be transformed to the metal phase 
-FeSi when heated above 1246 K. Since the bulk -FeSi is metallic, if a small part of -FeSi can be transformed into -FeSi selectively, it can be used as the electrode of a -FeSi based device. If the phase transition from -FeSi to phase takes place by the high-energy heavy ion irradiation, it is expected that some structural changes in the nano-region are observed from TEM images. On the basis of TEM images, contrast changes corresponded to phase transition, induced by 180 MeV Fe
irradiation were observed. Typically observed defects have an average diameter of 2 nm as a shape of column, which show mixture of amorphous and phase.