On Collective Interparticle Effects Underlying Unusual Coercive Behavior of Ensembles of Substituted Manganite Nanoparticles |
| A.I. Tovstolytkina, b, O.I. Nakonechnaa, b, I.V. Sharaya, A.V. Bodnarukc, O.V. Bondarc, V.M. Kalitac, d, S.M. Ryabchenkoc, Y.Y. Shlapae, S.O. Solopane, A.G. Belouse
aInstitute of Magnetism of the NAS of Ukraine and MES of Ukraine, 36-b Vernadsky Blvd., 03142 Kyiv, Ukraine bTaras Shevchenko National University of Kyiv, 64/13 Volodymyrska str., 01601 Kyiv, Ukraine cInstitute of Physics of the NAS of Ukraine, 46 Nauky Ave., 03028 Kyiv, Ukraine dNational Technical University of Ukraine ``Igor Sikorsky Kyiv Polytechnic Institute'', 37 Peremohy Ave., 03056 Kyiv, Ukraine eV.I. Vernadskii Institute of General and Inorganic Chemistry of the NAS of Ukraine, 32/34 Palladin Ave., 03142 Kyiv, Ukraine |
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| Temperature-dependent magnetic properties and spin echo decay behavior have been studied for an ensemble of La1-xSrxMnO3 (x=0.23) nanoparticles (of 30 nm in diameter) synthesized by the sol-gel method. Characteristic magnetic parameters, such as blocking temperature and effective Curie temperature for the ensemble, are determined. Enhanced coercivity and its unusual temperature dependence compared to bulk counterparts are revealed, and possible reasons for this phenomenon are discussed. A conclusion about the non-negligible role of interparticle interactions in the enhancement of the coercivity in the ensembles of substituted manganites is made. |
DOI:10.12693/APhysPolA.141.351 topics: magnetic hyperthermia, manganite nanoparticles, coercive force, spin echo decay |