室温強磁性有機材料に関する研究

概要

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Organic magnetic materials were fabricated by the arc discharge method with starting materials of nitrogen gas and triethylamine. After nitrogen gas or gaseous triethylamine was introduced into the chamber, an arc was　discharged between carbon electrodes with a purity of　99.99%. The as-made samples were annealed in　decreased air from 400°C to 10000e for 3 hours. The carbonaceous sample prepared in nitrogen gas was a diamagnetic material, while,the sample made from triethylamine was a ferromagnetic-like material whose magnetization was around 0.02 emulg at room temperature. After annealing between 500°C and 600°C, the magnetization of the ferromagnetic-like material increased by around 3 times as much as that of as-made one. However, the spin density, measured by electron spin resonance, decreased with increasing annealing temperature; in particular, it fell rapidly between 500°C and 600°C. Therefore, the linewidth of the ferromagnetic-like carbonaceous material after annealing at 500°C and 600°C was narrower than that of the as-made material, and the intensified spin interaction suggested an increase in the magnetization.