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Statements

Subject Item
n2:RIV%2F68378271%3A_____%2F13%3A00396756%21RIV14-GA0-68378271
rdf:type
skos:Concept n8:Vysledek
dcterms: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.
dcterms:title
Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics
skos:prefLabel
Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics Electromagnon in ferrimagnetic ε-Fe2O3 nanograin ceramics
skos:notation
RIV/68378271:_____/13:00396756!RIV14-GA0-68378271
n8:predkladatel
n9:ico%3A68378271
n4:aktivita
n16:P n16:I
n4:aktivity
I, P(GAP204/12/1163)
n4:cisloPeriodika
10
n4:dodaniDat
n10:2014
n4:domaciTvurceVysledku
n6:1371843 n6:3390888 n6:7348320 Goian, Veronica n6:1959050 n6:5666406
n4:druhVysledku
n14:J
n4:duvernostUdaju
n18:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
72393
n4:idVysledku
RIV/68378271:_____/13:00396756
n4:jazykVysledku
n5:eng
n4:klicovaSlova
terahertz spectroscopy; infrared spectroscopy; neutron scattering; electromagnon; multiferroics
n4:klicoveSlovo
n7:electromagnon n7:infrared%20spectroscopy n7:neutron%20scattering n7:terahertz%20spectroscopy n7:multiferroics
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[9E751948AC7D]
n4:nazevZdroje
Physical Review. B
n4:obor
n19:BM
n4:pocetDomacichTvurcuVysledku
6
n4:pocetTvurcuVysledku
10
n4:projekt
n17:GAP204%2F12%2F1163
n4:rokUplatneniVysledku
n10:2013
n4:svazekPeriodika
88
n4:tvurceVysledku
Kadlec, Christelle Goian, Veronica Gich, M. Savinov, Maxim Orlita, M. Prokleška, J. Kadlec, Filip Kamba, Stanislav Kempa, Martin Rols, S.
n4:wos
000323942600002
s:issn
1098-0121
s:numberOfPages
8
n15:doi
10.1103/PhysRevB.88.104301