High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange
- Jones, SPP
- Gaw, SM
- Doig, KI
- Prabhakaran, D
- Hétroy Wheeler, EM
- Boothroyd, AT
- Lloyd-Hughes, J
DOIAbstract
Magnetically induced ferroelectric multiferroics present an exciting new paradigm in the design of multifunctional materials, by intimately coupling magnetic and polar order. Magnetoelectricity creates a novel quasiparticle excitation--the electromagnon--at terahertz frequencies, with spectral signatures that unveil important spin interactions. To date, electromagnons have been discovered at low temperature (<70 K) and predominantly in rare-earth compounds such as RMnO3. Here we demonstrate using terahertz time-domain spectroscopy that intersublattice exchange in the improper multiferroic cupric oxide (CuO) creates electromagnons at substantially elevated temperatures (213-230 K). Dynamic magnetoelectric coupling can therefore be achieved i...
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