Relaxation Effects in Antiferromagnetic Resonance of CuCl_22H_2O

概要

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Various relaxation times observed in antiferromagnetic resonance of CuCl_22H_2O are investigated experimentally. Both pulsed and continuous high power microwaves of about 160 milli-watts were applied to the single crystal at low temperatures and the rise and decay times of the induced magnetization M_z, shift of the resonance line, and complex susceptibilities X' and X'' were investigated in detail. Three characteristic relaxation times are specified. The transverse component M_<x,y> decays with relaxation time T_2 of about 10^<-8>sec while the longitudinal component M_z relaxes with T_<1a> of about 10^<-7>sec. An empirical formula for T_<1a> is obtained as T_<1a> = (1.1±0.1) × 10^<-6>T-^<(5.0±0.5)> which is considered as the spin-lattice relaxation time. Another relaxation time T_<1b> of the order of 10^<-3>〜10^<-5>sec is also observed and the origin of this relaxation is attributed to the lattice-bath heat transfer relaxation.
社団法人日本物理学会の論文
1967-10-05