Download Magnetoelectric Response in Low-Dimensional Frustrated Spin by Shinichiro Seki PDF

By Shinichiro Seki

Electric keep an eye on of magnetic homes, or inversely, magnetic keep an eye on of dielectric homes in solids, is termed a magnetoelectric influence and has lengthy been investigated from the perspective of either primary physics and strength software. Magnetic and dielectric houses frequently convey minimum coupling, however it lately has been chanced on that magnetically brought about ferroelectricity in a few spiral magnets permits remarkably huge and flexible magnetoelectric responses. To stabilize such helimagnetism, magnetic frustration (competition among varied magnetic interactions) is taken into account the major. within the current paintings, of the commonest pissed off spin systems—triangular lattice antiferromagnets and edge-shared chain magnets—have systematically been investigated. regardless of the crystallographic simplicity of aim structures, wealthy magnetoelectric responses are ubiquitously saw. the present effects released right here provide an invaluable guide within the look for new fabrics with detailed magnetoelectric features, and likewise offer a huge foundation for a deeper figuring out of magnetoelectric phenomena in additional complicated systems.

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Sample text

This suggests that NC phase exists even at zero field in this temperature region once after high enough field is applied. In Fig. 0 11K 10K 1 9K 8K 6K 4K 0 0 2K 5 10 Magnetic Field (T) 0 9K 8K 7K 6K 5K 4K 3K 2K 5 10 Magnetic Field (T) 0 5 10 15 Magnetic Field (T) Fig. 02. Arrows indicate the field-scan direction of the measurement. 01. At zero field, the finite spontaneous polarization is observed between 6 and 9 K when the temperature is cooled without entering CM4 phase (Here, the poling electric field (∼200 kV/m) was removed after entering the ferroelectric phase, and then the displacement current was measured with both increasing and decreasing temperature from the stopped temperature).

This EM mode was found to rather vanish in the FE helimagnetic phase. The anti-correlation between the electromagnon and the noncollinear magnetism excludes the exchange-striction mechanism as the origin of dynamical ME coupling, and hence suggests that the observed electromagnon is electrically activated by the spin–orbit coupling. Result The detailed experimental setup for THz time-domain spectroscopy is described in “THz Time-Domain Spectroscopy”. By using this experimental methods, we can obtain the spectrum of complex transmittance t.

This strongly suggests the relevance of spin–orbit coupling to the present EM mode; the relatively weak peak intensity in the Im[ ] spectrum (one order of magnitude smaller than that of DyMnO3 [38]) also supports this scenario. Considering that the static P in NC(FE) is induced by the proper screw magnetic order through the spin–orbit interaction mediated modulation of Fe 3d−O2 p hybridization [10, 9], we may anticipate the analogous origin for the presently observed dynamical ME coupling in CM4.

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