Magnetic resonance study of bulk and thin film EuTiO.sub.3./sub.

0474004 - FZÚ 2018 RIV GB eng J - Článek v odborném periodiku
Laguta, Valentyn - Kamba, Stanislav - Maryško, Miroslav - Andrzejewski, B. - Kachlik, M. - Maca, K. - Lee, J.H. - Schlom, D. G.
Magnetic resonance study of bulk and thin film EuTiO₃.
Journal of Physics-Condensed Matter. Roč. 29, č. 10 (2017), 1-9, č. článku 105401. ISSN 0953-8984. E-ISSN 1361-648X
Grant CEP: GA MŠMT LO1409; GA MŠMT LM2015088; GA ČR GA15-08389S; GA ČR GA13-11473S
Institucionální podpora: RVO:68378271
Klíčová slova: multiferroic * phase transition * electron paramagnetic resonance * antiferromagnetic
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.617, rok: 2017

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. 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 ≈ 0.4. In the bulk samples, the spectra exhibited a distinct minimum in the linewidth at the Néel temperature, TN ≈ 5.5 K.In the film, the magnetic resonance spectrum is split below TN into several components due to excitation of the magnetostatic modes, corresponding to a non-uniform precession of magnetization.
Trvalý link: http://hdl.handle.net/11104/0271097