Electromagnon in the Z-type hexaferrite (BaxSr1-x)(3)Co2Fe24O41

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10325222" target="_blank" >RIV/00216208:11320/16:10325222 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.94.024419" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.94.024419</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.94.024419" target="_blank" >10.1103/PhysRevB.94.024419</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electromagnon in the Z-type hexaferrite (BaxSr1-x)(3)Co2Fe24O41

Popis výsledku v původním jazyce

We studied experimentally the high-temperature magnetoelectric (BaxSr1-x)(3)Co2Fe24O41 prepared as ceramics (x = 0, 0.2) and a single crystal (x = 0.5) using inelastic neutron scattering, THz time-domain, Raman, and far-infrared spectroscopies. The spectra, measured with varying temperature and magnetic field, reveal rich information about the collective spin and lattice excitations. In the ceramics, we observed an infrared-active magnon which is absent in E-omega perpendicular to z polarized THz spectra of the crystal, and we assume that it is an electromagnon active in E-omega parallel to z polarized spectra. On heating from 7 to 250 K, the frequency of this electromagnon drops from 36 to 25 cm(-1) and its damping gradually increases, so it becomes overdamped at room temperature. Applying external magnetic field has a similar effect on the damping and frequency of the electromagnon, and the mode is no longer observable in the THz spectra above 2 T, as the transverse-conical magnetic structure transforms into a collinear one. Raman spectra reveal another spin excitation with a slightly different frequency and much higher damping. Upon applying magnetic field higher than 3 T, in the low-frequency part of the THz spectra, a narrow excitation appears whose frequency linearly increases with magnetic field. We interpret this feature as the ferromagnetic resonance.

Název v anglickém jazyce

Electromagnon in the Z-type hexaferrite (BaxSr1-x)(3)Co2Fe24O41

Popis výsledku anglicky

We studied experimentally the high-temperature magnetoelectric (BaxSr1-x)(3)Co2Fe24O41 prepared as ceramics (x = 0, 0.2) and a single crystal (x = 0.5) using inelastic neutron scattering, THz time-domain, Raman, and far-infrared spectroscopies. The spectra, measured with varying temperature and magnetic field, reveal rich information about the collective spin and lattice excitations. In the ceramics, we observed an infrared-active magnon which is absent in E-omega perpendicular to z polarized THz spectra of the crystal, and we assume that it is an electromagnon active in E-omega parallel to z polarized spectra. On heating from 7 to 250 K, the frequency of this electromagnon drops from 36 to 25 cm(-1) and its damping gradually increases, so it becomes overdamped at room temperature. Applying external magnetic field has a similar effect on the damping and frequency of the electromagnon, and the mode is no longer observable in the THz spectra above 2 T, as the transverse-conical magnetic structure transforms into a collinear one. Raman spectra reveal another spin excitation with a slightly different frequency and much higher damping. Upon applying magnetic field higher than 3 T, in the low-frequency part of the THz spectra, a narrow excitation appears whose frequency linearly increases with magnetic field. We interpret this feature as the ferromagnetic resonance.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICAL REVIEW B

ISSN

2469-9950

e-ISSN

—

Svazek periodika

94

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

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Kód UT WoS článku

000379649800005

EID výsledku v databázi Scopus

2-s2.0-84978389105