Size Effect's Influence on the Magnetic Phase Transitions in the Nanosized Magnets

被引：4

作者：

Afremov, L. L. ^{[1
]}

Kirienko, Yu. V. ^{[2
]}

Petrov, A. A. ^{[1
]}

Chepak, A. K. ^{[1
]}

机构：

[1] Far Eastern Fed Univ, Vladivostok, Russia

[2] European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2023年 / 36卷 / 02期

关键词：

Magnetic phase transition; Nanoparticles; Ultrathin magnetic films; Random interaction field; Critical concentration; Nanosized magnets; EFFECTIVE CRITICAL EXPONENTS; CRITICAL-BEHAVIOR; ISING-MODEL; DIMENSIONAL CROSSOVER; CURIE-TEMPERATURE; FILMS; DEPENDENCE; DIAGRAMS;

D O I：

10.1007/s10948-022-06482-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a simple approach (the mean spin method) to investigate the influence of the size of nanoparticles (thickness of ultrathin films) and the concentration of << magnetic atoms >> on the critical temperature and magnetic susceptibility in the magnetic phase transition region. The critical spin-spin correlation indices for nanosized magnets are calculated using the scaling relation. It is shown that the critical concentration pC of the transition from an ordered to an unordered state increases as the characteristic size of nanoparticles (thickness of ultrathin films) decreases. The results obtained by the mean spin method are in qualitative agreement with the Monte Carlo simulation and experimental data.

引用

页码：587 / 600

页数：14

共 74 条

[61] Effect of size reduction on the ferromagnetism of the manganite La1-xCaxMnO3 (x=0.33) [J].