2006
DOI: 10.1038/nphys212
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Possible evidence for electromagnons in multiferroic manganites

Abstract: M agnetodielectric 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, TbMnO 3 and GdMnO 3 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 a… Show more

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Cited by 550 publications
(525 citation statements)
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“…[26][27][28] Electromagnons, which have been extensively studied in a number of rare-earth manganites, are observed to possess optical conductivities of at least a factor of 10 larger. 9,29 Although this method of comparison does not yield objective certainty, we can further support its conclusion by employing optical sum rule analysis on our measured reflectance data. Since an electromagnon contributes to the dielectric constant, it must gain spectral weight from a dipole active excitation, the main candidates being domain relaxations, phonons, or electronic transitions.…”
Section: Nature and Isotropymentioning
confidence: 68%
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“…[26][27][28] Electromagnons, which have been extensively studied in a number of rare-earth manganites, are observed to possess optical conductivities of at least a factor of 10 larger. 9,29 Although this method of comparison does not yield objective certainty, we can further support its conclusion by employing optical sum rule analysis on our measured reflectance data. Since an electromagnon contributes to the dielectric constant, it must gain spectral weight from a dipole active excitation, the main candidates being domain relaxations, phonons, or electronic transitions.…”
Section: Nature and Isotropymentioning
confidence: 68%
“…Electromagnons were first proposed as strongly renormalized spin waves with dipolar momentum. 9 Since their discovery, electromagnons have been extensively studied in rare earth manganite compounds, namely in TbMnO 3 , where a large body of recent literature (Raman 23 , neutron 24 , and infrared 25 ) has tied the excitation to the lattice itself. The work ) 7K 15K 30K 50K 70K 85K 100K 110K 120K 130K 140K 150K 200K 250K 300K 0 100 200 300 Temperature (K) 318 has resulted in a generalized hybrid magnon-phonon mode picture of electromagnons.…”
Section: Magnetic Excitationsmentioning
confidence: 99%
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“…The lower-lying sharp peak at 1 meV represents the spin-current electromagnon mode 47 , while the higher-lying broad peak is assigned to the E ω -active but H ω -inactive magnon (located at the magnetic zone edge); the latter was the first-reported electromagnon for RMnO 3 (ref. 48). A large directional dichroism of up to ∼50% has been observed for the lower-lying electromagnon modes with spincurrent origin.…”
Section: Reproduced From Ref 39 Iop (A-c); and Ref 42 Macmillan Pmentioning
confidence: 91%
“…Typical examples are e.g 4 multiferroic systems which hold the promise to switch the magnetization e.g. with electrical fields [17][18][19][20].…”
Section: Introductionmentioning
confidence: 99%