2025/07/24 by Rostyslav O. Serha, Serha, Rostyslav O., Anna Pomyalov +5 · 2 citations
Materials Science · #FOS: Physical sciences #Magnetic Properties and Applications #Materials Science (cond-mat.mtrl-sci) #Statistical Mechanics (cond-mat.stat-mech)
paper · pdf · doi:10.48550/arxiv.2507.18209
openalex publication_date 2025/07/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
Recent advancements in spintronics and fundamental physical research have brought increased attention to the rare-earth-based magnetically ordered materials. One of the important properties of these materials is the temperature dependence of the spontaneous magnetization M(T). Recently, a successful framework was proposed for the theoretical description of M(T) across the entire temperature range from zero to the Curie temperature in simple cubic ferromagnets, EuO and EuS. We extend this approach to compute and analyze M(T) for multi-sublattice collinear ferrimagnets such as Yttrium Iron Garnet Y3Fe5 O12. We analyzed and generalized for multi-sublattice collinear ferrimagnets two well-known approximations describing M(T). The first approach is the Bloch-3/2 law, which describes the suppression of M(T) due to spin-wave excitation, and is valid in the low-temperature limit T << Tc. The second one is Weiss's mean-field approximation, which provides a reasonable description of M(T) near Tc. Using a single tuning parameter, we combine these two approaches to describe M(T) for any 0