Spivakov Aleksandr A, Lin Chun-Rong, Chen Ying-Zhen, Huang Li-Huai
Department of Applied Physics, National Pingtung University, No. 4-18 Minsheng Rd., Pingtung City 90003, Taiwan.
Nanomaterials (Basel). 2023 Apr 4;13(7):1273. doi: 10.3390/nano13071273.
FeMnO nanoparticles were successfully synthesized using a combustion method. The influence of the heating temperature on the evolution of the structural and magnetic properties has been studied using various methods. The structural analysis results revealed that as-synthesized nanoparticles have a tetragonal structure with an average size of ~24 nm. The magnetic measurements of the sample showed its ferrimagnetic nature at room temperature with hysteresis at low fields. Temperature-dependent magnetization measurements allowed for the conclusion that the Curie temperature for FeMnO nanoparticles was ~465 °C. After high-temperature magnetic measurements, during which the samples were heated to various maximum heating temperatures (T) in the range from 500 to 900 °C, it was found that the structure of the samples after cooling to room temperature depended on the heating temperature. Herewith, when the heating temperature was 600 < T < 700 °C, an irreversible structural phase transition occurred, and the cooled samples retained a high-temperature cubic structure. The results of the magnetic analysis showed that the samples, following high-temperature magnetic measurements, demonstrated ferrimagnetic behavior.
采用燃烧法成功合成了FeMnO纳米颗粒。利用多种方法研究了加热温度对结构和磁性能演变的影响。结构分析结果表明，合成的纳米颗粒具有四方结构，平均尺寸约为24 nm。样品的磁性测量表明，其在室温下具有亚铁磁性，在低场下具有磁滞现象。温度依赖的磁化强度测量结果表明，FeMnO纳米颗粒的居里温度约为465℃。在高温磁性测量过程中，将样品加热到500至900℃范围内的各种最高加热温度（T），发现冷却至室温后样品的结构取决于加热温度。因此，当加热温度为600 < T < 700℃时，发生了不可逆的结构相变，冷却后的样品保留了高温立方结构。磁性分析结果表明，经过高温磁性测量的样品表现出亚铁磁性行为。
