Low Temperature Physics: 48, 330 (2022); https://doi.org/10.1063/10.0009738
Fizika Nizkikh Temperatur: Volume 48, Number 4 (April 2022), p. 372-377    ( to contents , go back )

Low-temperature ferromagnetic resonance in bare and SiO2 coated La0.775 Sr0.225 MnO3 nanoparticles

K. Yu. Sova, A. S. Vakula, Т. V. Кalmykova, and S. I. Tarapov

O. Ya. Usikov Institute for Radiophysics and Electronics of NAS of Ukraine, Kharkiv 61085, Ukraine
E-mail: katerinesova@gmail.com

S. I. Petrushenko

V. Karazin National University of Kharkiv, Kharkiv 61022, Ukraine

A. G. Belous and S. O. Solopan

Institute of General and Inorganic Chemistry of NAS of Ukraine, Kyiv 03142, Ukraine
pos Анотація:613

Received November 15, 2021, published online February 25, 2022

Abstract

La0.775Sr0.225MnO3 nanoparticles were synthesized by sol-gel method with heat treatment at T = 1073 K and covered with silica shells of various thicknesses. Analysis of their experimental ferromagnetic resonance spectra was carried out in the temperature range of 77–290 K. The linewidth of absorption curves changes in a nonlinear manner in coated samples in the temperature range of 230 K ≤ T ≤ 290 K. Such changes indicate the appearance of external stresses between nanoparticles due to the difference in the thermal expansion coefficients of the two materials.

Key words: nanoparticles, nanopowders, ferromagnetic resonance, microwave frequencies, low temperatures.

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