摘要
采用溶胶-凝胶法制备La_(0.25)Ca_(0.75)MnO_3纳米颗粒,并分别在空气和氩气气氛下退火,获得颗粒尺寸约为100 nm的两种样品.对两种样品磁滞回线的测量研究表明:与空气气氛下退火相比,氩气气氛退火后样品中的氧原子配比减少,减弱了颗粒表面未补偿自旋的铁磁耦合,从而减弱了交换偏置效应.
Polycrystalline nanoparticles of La0.25 Ca0. 75 MnO3 air and Ar respectively. The average size of nanoparticles was about 100 nm. The magnetic hysteresis loops tot the samples were measured. The results indicate that the oxygen content decreases as nanoparticles are annealed in Ar atmosphere, and the exchange bias effect reduces due to the weakened ferromagnetic coupling between the uncompensated surface spins.
出处
《厦门理工学院学报》
2016年第5期60-63,共4页
Journal of Xiamen University of Technology
基金
福建省中青年教师教育科研项目(JA13231)
国家自然科学基金项目(61504113)
关键词
锰氧化物
纳米颗粒
交换偏置效应
氧缺失
La0.25 Ca0. 75 MnO3
nanoparticles
exchange bias effect
oxygen deficiency
