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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2016

Confidentiality

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

Name of the periodical

PHYSICAL REVIEW B

ISSN

2469-9950

e-ISSN

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Volume of the periodical

94

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

8

Pages from-to

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UT code for WoS article

000379649800005

EID of the result in the Scopus database

2-s2.0-84978389105