A. I. Dmitriev, S. V. Zaitsev, M. S. Dmitrieva, “Effect of the concentration of the substitution impurity strontium on the magnetic ordering temperature in La$_{1-x}$Sr$_x$FeO$_{3-\delta}$ and its sensitivity to heat treatment”, Fizika Tverdogo Tela, 2025, Volume 67, Issue 1,Pages 156

This article is cited in 1 paper

XVI Russian Conference on Semiconductor Physics, October 7-11, 2024, St. Petersburg
Magnetism, spintronics

Effect of the concentration of the substitution impurity strontium on the magnetic ordering temperature in La$_{1-x}$Sr$_x$FeO$_{3-\delta}$ and its sensitivity to heat treatment

A. I. Dmitriev^a, S. V. Zaitsev^b, M. S. Dmitrieva^a

^a Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region
^b Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia

Abstract: The dependences of magnetization on temperature of La$_{1-x}$Sr$_x$FeO$_{3-\delta}$ ($x$ = 0.33, 0.50, 0.67) samples before and after vacuum heat treatment are studied. The Neel temperature $T_N$, at which weak noncollinear ferromagnetism is established, is determined for each sample. The introduction of a substitutional Sr impurity into La$_{1-x}$Sr$_x$FeO$_{3-\delta}$ leads to a decrease in $T_N$. This effect is compensated by vacuum heat treatment, during which an increase in $T_N$ is observed. Antiferromagnetic ordering at room temperature in annealed samples is confirmed by the presence of an intense Raman peak of two-magnon scattering at 1360 cm$^{-1}$ in the Raman spectra.

Keywords: substituted lanthanum orthoferrites, canted antiferromagnetism, vacuum annealing,

Received: 27.10.2024
Revised: 17.12.2024
Accepted: 17.12.2024

DOI: 10.61011/FTT.2025.01.59782.282