Abstract
In this paper, we report the magnetic properties of carbon fine particles prepared in He plasma.
The exprimental results obtained are summarized as follows: The magnetic properties of the carbon fine particle are effected by a He gas pressure. The saturation magnetization of the carbon fine particle are strikingly influenced by a degree of crystallinity. When the degree of crystallinity of the carbon fine particle is approximately 58%, the saturation magnetization is 8.5×10-7Wb•m/kg and the coercive force is 6.13kA/m. The saturation magnetization of the carbon fine particle having the degree of crystallinity of 58% decreases gradually with increasing temperature and disappears at temperature of 334°C. From the electron spin resonance spectrum, we calculated to be gyromagnetic ratio (g-factor) of 2.002 and electron spin density of 1.6×1022kg-1. From the value of g-factor, it seems that magnetism of the carbon fine particle in the room temperature is caused by spin of electron.
