High temperature ferromagnetism in mechanically milled 6H-SiC nanoparticles. (April 2019)

• Record Type: Journal Article
• Authors: Wu, Yanyan; Yang, Guijin; Fu, Yujun; Ma, Shuyi; Zhu, Botao; Zhao, Jing; Li, Jinyun; Li, Yalong
• Is Part Of: Superlattices and microstructures. Volume 128(2019)
• Page Start: 358
• Page End: 364
• Publication Date: 2019-04
• Subjects: Silicon carbide -- High temperature ferromagnetism -- High-energy ball milling -- Defects; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2019.02.007
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: Silicon carbide (SiC) nanoparticles with different sizes were successfully obtained by high energy ball milling. Room temperature magnetic measurements showed that the saturation magnetization of milled-SiC nanoparticles increases monotonically from 0.0006 to 0.0032 emu/g with increasing milling time, while the bulk SiC powders present diamagnetism. Besides, the high temperature hysteresis curves indicated that the Curie temperature of the milled-SiC nanoparticles was much over 800 K. Meanwhile, the results of X-ray diffraction, Raman spectrometer and scanning electron microscope suggested that the surface defects were introduced into the milled-SiC nanoparticles. Further studies via electron spin resonance and photoluminescence proved that the surface defects are responsible for the origin of ferromagnetism in milled-SiC nanoparticles. Highlights: SiC nanoparticles with different sizes were successfully prepared by simple high-energy ball milling. The milled-SiC nanoparticles exhibit obviously high ferromagnetism. The T c was much over 800 K. The intrinsic ferromagnetism for the milled-SiC nanoparticles is ascribed to the surface defects.