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Magnetic resonance study of bulk and thin film EuTiO<sub>3</sub>
Laguta, V V,Kamba, S,Maryš,ko, M,Andrzejewski, B,Kachlí,k, M,Maca, K,Lee, J H,Schlom, D G Institute of Physics 2017 Journal of Physics, Condensed Matter Vol.29 No.10
<P>Magnetic resonance spectra of EuTiO<SUB>3</SUB> 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 Eu<SUP>2+</SUP> 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 ≈0.4. In the bulk samples, the spectra exhibited a distinct minimum in the linewidth at the Néel temperature, <I>T</I> <SUB>N</SUB> ≈ 5.5 K, while the resonance field practically does not change even on cooling below <I>T</I> <SUB>N</SUB>. This is indicative of a small magnetic anisotropy ~320 G in the antiferromagnetic phase. In the film, the magnetic resonance spectrum is split below <I>T</I> <SUB>N</SUB> 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<SUP>−3</SUP> or 5.5 <I>µ</I> <SUB>B</SUB>/unit cell at <I>T</I> = 3.5 K.</P>
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