By Yuki Shiomi
This e-book offers an research of the anomalous and topological corridor results in a few itinerant ferromagnets and helimagnets through measurements of corridor results pushed via electric or warmth present. New clarifications are supplied for spin-dependent corridor results prompted by means of the Berry section, skew scattering, and scalar spin chirality.
The writer unearths the scattering-free nature of the Berry-phase-induced anomalous corridor present through accomplishing the 1st comparative research of electric and thermal corridor results. The impurity-element dependence of the anomalous corridor impression because of skew scattering is systematically investigated within the low-resistivity zone for Fe. new examples displaying a topological corridor influence are present in helimagnets, within which nonzero scalar spin chirality arises from the modulation of spin constitution via Dzyaloshinsky–Moriya (DM) interplay. this type of DM-interaction-mediated topological corridor influence is a brand new form of topological corridor impression. additionally the temperature dependence of topological corridor phrases within the thermal corridor impression and Nernst–Ettingshausen impact is located to be completely different from that during corridor effect.
These effects can be valuable for purposes of spin present to units with low energy consumption.
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Additional info for Anomalous and Topological Hall Effects in Itinerant Magnets
At the lowest temperature, the impurity scattering is dominant and L x x = L 0 . With increasing temperature, the Wiedemann-Franz law is violated due to the phonon scattering. In this region, L x x decreases from L 0 rapidly. The magnitude of the deviation is larger in low-resistivity materials. In the high-temperature region, the change in energy of each electron in a collision (∼k B Θ D ) should be small compared with k B T (quasi-elastic scattering). L x x approaches L 0 again with increasing temperature and the Wiedemann-Franz law is well obeyed in T > Θ D .
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2. 03 are composed of well-defined H -linear normal and M-linear anomalous terms. 003 contrary to other specimens, signaling the sensitivity of the low-T Hall resistivity to the species and amounts of the impurities and hence to the impurity scattering. A /T for all the samples The anomalous parts of the Hall conductivities σxAy and κxy are plotted as a function of T in Fig. 1b, d. These are calculated from the linear extrapolation from the high-H values above the saturation H of the magnetization, A /T for nominally-pure Fe as exemplified by dashed lines in Fig.