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Funct. Mater. 2018; 25 (2): 241-245.

doi:https://doi.org/10.15407/fm25.02.241

Electron spin resonance and magnetic phase transitions in manganite perovskite La0.78Sr0.22MnO3 synthesized by the solid-phase reaction method

T.Kalmykova1, A.Vakula1,2, S.Nedukh1,3, S.Tarapov1,2,3, A.Belous4, V.Krivoruchko5, R.Suhov2

1O.Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12 Acad. Proskura Str., 61085 Kharkiv, Ukraine
2Kharkiv National University of Radio Electronics, 14 Nauky Ave., 61166 Kharkiv, Ukraine
3V.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
4Institute of General and Inorganic Chemistry, 32/34 Palladina Blvd., 03142 Kyiv, Ukraine
5Donetsk Physics & Technology Institute, National Academy of Sciences of Ukraine, 46 Nauky Ave. 03680 Kyiv, Ukraine

Abstract: 

Magnetic properties of nanopowder of perovskite manganite doped with strontium La0.78Sr0.22MnO3 are studied using electron paramagnetic resonance method. Analysis of the experiments in the temperature range T = 77-290 K shows that this structure is a typical nanostructure only at T < 100 K. In the remaining temperature region, the structure is in the superparamagnetic and noncollinear superparamagnetic magnetic state.

Keywords: 
electron spin resonance, magnetic nanopowder, superparamagnetic state.
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