About: Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics

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About: Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Electromagnons are known from multiferroics as spin waves excited by the electric component of electromagnetic radiation. We report the discovery of an excitation in the far-infrared spectra of ɛ-Fe2O3, which we attribute to an electromagnon appearing below 110 K where the ferrimagnetic structure becomes incommensurately modulated. Inelastic neutron scattering shows that the electromagnon energy corresponds to that of a magnon from the Brillouin-zone boundary. Dielectric measurements did not reveal any sign of ferroelectricity in ɛ-Fe2O3 down to 10 K, despite its acentric crystal structure. This shows that the activation of an electromagnon requires, in addition to the polar ferrimagnetic structure, a modulation of the magnetic structure. We demonstrate that a combination of inelastic neutron scattering with infrared and/or terahertz (THz) spectroscopies allows detecting electromagnons in ceramics where no crystal-orientation analysis of THz and infrared spectra is possible. Electromagnons are known from multiferroics as spin waves excited by the electric component of electromagnetic radiation. We report the discovery of an excitation in the far-infrared spectra of ɛ-Fe2O3, which we attribute to an electromagnon appearing below 110 K where the ferrimagnetic structure becomes incommensurately modulated. Inelastic neutron scattering shows that the electromagnon energy corresponds to that of a magnon from the Brillouin-zone boundary. Dielectric measurements did not reveal any sign of ferroelectricity in ɛ-Fe2O3 down to 10 K, despite its acentric crystal structure. This shows that the activation of an electromagnon requires, in addition to the polar ferrimagnetic structure, a modulation of the magnetic structure. We demonstrate that a combination of inelastic neutron scattering with infrared and/or terahertz (THz) spectroscopies allows detecting electromagnons in ceramics where no crystal-orientation analysis of THz and infrared spectra is possible. (en)
Title	Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics (en)
skos:prefLabel	Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics (en)
skos:notation	RIV/68378271:_____/13:00396756!RIV14-GA0-68378271
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP204/12/1163)
http://linked.open...iv/cisloPeriodika	10
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Kempa, Martin Kamba, Stanislav Savinov, Maxim Kadlec, Filip Kadlec, Christelle Goian, Veronica
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	72393
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/13:00396756
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	terahertz spectroscopy; infrared spectroscopy; neutron scattering; electromagnon; multiferroics (en)
http://linked.open.../riv/klicoveSlovo	electromagnon terahertz spectroscopy neutron scattering infrared spectroscopy multiferroics
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[9E751948AC7D]
http://linked.open...i/riv/nazevZdroje	Physical Review. B
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	6 (xsd:int)
http://linked.open...cetTvurcuVysledku	10 (xsd:int)
http://linked.open...vavai/riv/projekt	Phonon and dielectric spectroscopy of multiferroics
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	88
http://linked.open...iv/tvurceVysledku	Kamba, Stanislav Kempa, Martin Goian, Veronica Prokleška, J. Savinov, Maxim Kadlec, Christelle Kadlec, Filip Orlita, M. Rols, S. Gich, M.
http://linked.open...ain/vavai/riv/wos	000323942600002
issn	1098-0121
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevB.88.104301

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