Magnetic resonance study of bulk and thin film EuTiO3
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF PHYSICS-CONDENSED MATTER (30pkt w roku publikacji)
ISSN
0953-8984
EISSN
1361-648X
Wydawca
IOP PUBLISHING LTD
DOI
URL
Rok publikacji
2017
Numer zeszytu
10
Strony od-do
105401
Numer tomu
29
Link do pełnego tekstu
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Autorzy
(liczba autorów: 8)
Pozostali autorzy
+ 7
Słowa kluczowe
en
multiferroic
phase transition
electron paramagnetic resonance
antiferromagnetic
Streszczenia
Język
en
Treść
Magnetic resonance spectra of EuTiO3 in both bulk and thin film form were taken at temperatures from 3-350 K and microwave frequencies from 9.2-9.8 and 34 GHz. In the paramagnetic phase, magnetic resonance spectra are determined by magnetic dipole and exchange interactions between Eu2+ spins. In the film, a large contribution arises from the demagnetization field. From detailed analysis of the linewidth and its temperature dependence, the parameters of spin-spin interactions were determined: the exchange frequency is 10.5 GHz and the estimated critical exponent of the spin correlation length is approximate to 0.4. In the bulk samples, the spectra exhibited a distinct minimum in the linewidth at the Neel temperature, T-N approximate to 5.5 K, while the resonance field practically does not change even on cooling below T-N. This is indicative of a small magnetic anisotropy similar to 320 G in the antiferromagnetic phase. In the film, the magnetic resonance spectrum is split below T-N into several components due to excitation of the magnetostatic modes, corresponding to a non-uniform precession of magnetization. Moreover, the film was observed to degrade over two years. This was manifested by an increase of defects and a change in the domain structure. The saturated magnetization in the film, estimated from the magnetic resonance spectrum, was about 900 emu cm(-3) or 5.5 mu(B)/unit cell at T = 3.5 K.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
826451
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