Low-temperature ferromagnetic resonance in bare and SiO2coated La0.775Sr0.225MnO3nanoparticles

• Main Authors: Belous, A.G (Author), Kalmykova, T.V (Author), Petrushenko, S.I (Author), Solopan, S.O (Author), Sova, K.Yu (Author), Tarapov, S.I (Author), Vakula, A.S (Author)
• Format: Article
• Language: English
• Published: American Institute of Physics Inc. 2022
• Subjects: Absorption curves; Coated sample; External stress; Ferromagnetic materials; Ferromagnetic resonance; Ferromagnetism; Lows-temperatures; Nanoparticles; Resonance spectrum; Silica; Silica shell; Sol- gel methods; Sol-gel process; Sol-gels; Synthesis (chemical); Synthesised; Temperature; Temperature range; Thermal expansion; Two-materials
• Online Access: View Fulltext in Publisher
• ISBN: 1063777X (ISSN)
• DOI: 10.1063/10.0009738

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 change 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. © 2022 Author(s).