Resonance properties of the quasi-one-dimensional Ising magnet [(CH{sub}3){sub}3NH]CoCl{sub}3·2H{sub}O in the paramagnetic and magnetically ordered phases

摘要

A study is made of the angular, frequency-field, and temperature dependences of the magnetic resonance of the quasi-one-dimensional Ising magnet [(CH{sub}3){sub}3NH]CoCl{sub}3 ·2H{sub}2O in the paramagnetic phase. The experimental results obtained are explained in a model of spin-cluster resonance in a strongly exchange-coupled spin chain. The frequency-field dependences of the ferromagnetic resonance spectrum measured below the Neel temperature are studied for magnetic-field directions along the crystallographic axes a, b, and c. It is shown that for H→0 the spin-wave spectrum of this quasiferromagnet has two gaps (v{sub}1 =70.1 GHz and v{sub}2=52.5 GHz).