Low Temperature Physics: 38, 807 (2012); https://doi.org/10.1063/1.4752093 (12 pages)
Физика Низких Температур: Том 38, Выпуск 9 (Сентябрь 2012), c. 1018-1031 ( к оглавлению , назад )
Electrically active magnetic excitations in antiferromagnets (Review Article)
O.O. Galkin Donetsk Institute for Physics and Technology, National Academy of Science of Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
Received March 20, 2012
The magnetic resonance operation by electric field is highly nontrivial but the most demanding function in the future spin-electronics. Recently observed in a variety of multiferroics materials named the collective electrically active magnetic excitations, frequently referred to as “electromagnons”, reveal a possible way to implement such a function. Experimental advances in terahertz spectroscopy of electromagnons in multiferroics as well as related theoretical models are reviewed. The earlier theoretical works, where the existence of electric-dipole active magnetic excitations in antiferro- and ferrimagnets with collinear spin structure has been predicted, are also discussed. Multi-sublattice magnets with electrically active magnetic excitations at room temperature give a direct possibility to transform one type of excitation into another in a terahertz time-domain. This is of crucial importance for the magnon-based spintronics as only the short-wavelength exchange magnons allow the signal processing on the nanoscale distance.
PACS: 75.80.+q Magnetomechanical effects, magnetostriction;
Ключевые слова: ferrimagnet, electromagnons, spintronics, electron paramagnetic resonance.