J. Phys. Colloques 38 (1977) C2-77-C2-77
ELECTRON SPIN RESONANCE IN FINE PARTICLES OF METALLIC LITHIUMT. FUJITA1, K. SAIKI2 and Y. SHIMIZU3
1 Department of Physics, Nagoya University, Nagoya, 464, Japan
2 Ishikawajima-Harima Heavy Industries Co., Ltd. Ootemachi Chiyoda-ku Tokyo, 100, Japan.
3 Kinjo Gakuin, Nagoya, Japan.
The relaxation of conduction electron spins in fine particles of metallic lithium was measured by an X-band spectrometer at room temperature. Those particles of diameter from about 3 000 to 100 Å were prepared by evaporation method in an inert gas atmosphere. The line of the electron spin resonance broadened from 2.7 to 9.2 Oe as the average particle diameter was reduced from 3 000 to 1 000 Å. As the particle diameter was further reduced, the line narrowed again remarkably. The narrowest line width obtained was 1.9 Oe for particles of diameter 100 Å. The effect of line broadening is explained by the limitation of electron spin life time by the spin reverse scattering at the surface of the particles. The narrowing of line at smaller particle region is considered to the quenching of spin reverse scattering by the quantization of electronic energy levels in fine particles.