Download e-book for iPad: Anomalous and Topological Hall Effects in Itinerant Magnets by Yuki Shiomi

By Yuki Shiomi

ISBN-10: 4431543600

ISBN-13: 9784431543602

ISBN-10: 4431543619

ISBN-13: 9784431543619

This e-book provides an research of the anomalous and topological corridor results in a few itinerant ferromagnets and helimagnets by way of measurements of corridor results pushed by way of electric or warmth present. New clarifications are supplied for spin-dependent corridor results caused 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 impact attributable to skew scattering is systematically investigated within the low-resistivity quarter for Fe. new examples displaying a topological corridor impact are present in helimagnets, during which nonzero scalar spin chirality arises from the modulation of spin constitution via Dzyaloshinsky–Moriya (DM) interplay. the sort of DM-interaction-mediated topological corridor impact is a brand new kind of topological corridor impact. additionally the temperature dependence of topological corridor phrases within the thermal corridor impact and Nernst–Ettingshausen impression is located to be completely different from that during corridor effect.

These effects can be invaluable for purposes of spin present to units with low strength consumption.

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3 Nernst Effect Measurement Nernst effect (Nernst-Ettingshausen effect) measurement was done by a steady-state method. The longitudinal temperature gradient was measured with thermocouples or Cernox thermometers. ). We used photosphor-bronze wires in voltage measurements for the sake of minimal heat loss. A typical setup for Nernst measurement is shown in Fig. 3. Seebeck and Nernst effects are manifested by Pertier conductivity α, which is defined by the following relation, j e = σE + α(−∇T ). 13) where Sx x = E x /∇x T and eN = −E y /∇x T are Seebeck and Nernst coefficients, respectively.

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Lett. 97, 026603 (2006) 8. I. Y. J. Beenakker, Phys. Rev. B 84, 035133 (2011) Chapter 3 Scattering-Free Nature of Intrinsic Anomalous Hall Current Abstract First, we investigate the intrinsic AHE which is related with Berry-phase. In contrast to the extrinsic mechanisms, an intrinsic AHE induced by the Berry phase is, in principle, not affected by the scattering. Experimentally, the relation that ρ yx ∝ ρx2x (namely, Hall conductivity σx y = ρ yx /ρx2x is independent of ρx x ) is identified in some materials and is thought to be the evidence of the dissipationless nature of anomalous Hall current (C.

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Anomalous and Topological Hall Effects in Itinerant Magnets by Yuki Shiomi

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