Possible evidence for electromagnons in multiferroic manganites

By A. Pimenov, A. Mukhin, V. Ivanov, V. Travkin, A. Balbashov, A. Loidl. 2006

417 citations recorded by the source corpus.

Magnetodielectric materials are characterized by a strong coupling of the magnetic and dielectric properties and, in rare cases, simultaneously show both magnetic and polar order. Among other multiferroics, TbMnO3 and GdMnO3 reveal a strong magneto–dielectric coupling and as a consequence fundamentally different spin excitations exist: electro-active magnons (or electromagnons), spin waves that can be excited by a.c. electric fields. Here we provide evidence that these excitations appear in the phase with an incommensurate magnetic structure of the manganese spins. In external magnetic fields this incommensurate structure can be suppressed and the electromagnons wiped out, thereby inducing considerable changes in the index of refraction from d.c. up to terahertz frequencies. Hence, besides adding a creature to the zoo of fundamental excitations, the refractive index can be tuned by moderate magnetic fields, which enables the design of the next generation of optical switches and optoelectronic devices.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/eff891a5a076d77b671e2b7e7142f12ffc3d6bfa

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In Electronic, Optical and Magnetic Materials

In Materials Chemistry

Citations in the corpus

Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology (2015, background): “As early as 2006, Pimenov et al. reported an observation of the Terahertzmagnetodielectric effect and electromagnon spectra in GdMnO3 and TbMnO3 [266].”
Dynamical Multiferroicity (2016, background): “electric fields – was demonstrated ten years ago in multiferroic materials with an incommensurate (cycloidal or helicoidal) magnetic structure [47].”
Multiferroics: a magnetic twist for ferroelectricity. (2007, background): “Since then, a few reports have appeared on the absorption peaks at frequencies typical for magnetic excitations, most recentl”
Magnetoelectric resonance with electromagnons in a perovskite helimagnet (2011, background): “Such magnetically driven ferroelectricity promises a concomitant collective spin excitation endowed with electric dipole activity, termed an electromagno”
Spin insulatronics (2020, background): “Conceptually, it has been shown that magnons in magnetoelectrics can be hybrid entities because of their coupling to the electric order [106, 107].”
Multiferroics: progress and prospects in thin films. (2007, background): “Experimental results are just beginning to emerge, with the first demonstration of hybrid excitations in multiferroic manganites recently reporte”