By Shinichiro Seki
Electric regulate of magnetic homes, or inversely, magnetic regulate of dielectric houses in solids, is named a magnetoelectric influence and has lengthy been investigated from the perspective of either basic physics and capability program. Magnetic and dielectric homes frequently convey minimum coupling, however it lately has been chanced on that magnetically precipitated ferroelectricity in a few spiral magnets allows remarkably huge and flexible magnetoelectric responses. To stabilize such helimagnetism, magnetic frustration (competition among diverse magnetic interactions) is taken into account the most important. within the current paintings, of the most common pissed off spin systems—triangular lattice antiferromagnets and edge-shared chain magnets—have systematically been investigated. regardless of the crystallographic simplicity of aim platforms, wealthy magnetoelectric responses are ubiquitously saw. the present effects released right here provide an invaluable guide within the look for new fabrics with distinct magnetoelectric features, and likewise offer a major foundation for a deeper knowing of magnetoelectric phenomena in additional complicated systems.
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Example text
This mode should be active only with E ω [110], which is consistent with the experimental results. The disappearance of EM mode in the NC(FE) phase may reflect the alteration of magnetic symmetry or Brillouin-zone folding, but the detail is left to be clarified. We further investigated the development of the EM mode in static H applied along the [001] direction.
While the NC(FE) phase is replaced by CM5 under H[001] > 12 T, we found that NC(FE) survives against in-plane H (H[110] and H[110] ¯ ) up to 14 T. Even with in-plane H , the magnitude of P[110] shows significant H -dependence, as shown in Fig. 14d and f: P[110] increases with H[110] and decreases with H[110] ¯ . This behavior can be interpreted as the rearrangement of multiferroic domains, as described below. In general, antiferromagnetically ordered spin moments prefer to lie within the plane perpendicular to H , as typically observed for the spin flop transition.
One was used as the pump and another was used as the gate. The pump pulses were irradiated on the low-temperature-grown GaAs (LT- GaAs) photoconducting device coupled with a dipole antenna to induce the terahertz radiation. The wire grid (WG) polarizers were inserted in between off-axis paraboloidal mirrors to obtain the linear polarization. The polarized terahertz pulse was focused on the sample by off-axis paraboloidal mirrors. The cryostat was placed within the box filled with dry N2 -gas to eliminate the absorption of water.