Magnetization Process of Ising Spin Chains at the Domain Boundaries in CoCl_22H_2O

概要

論文の詳細を見る
Small magnetization jumps in CoCl_22H_2O recently observed by Kuramitsu et al. are explained by considering the flopping of Ising spin chains at the domain boundaries of ferrimagnetic CoCl_22H_2O. The mechanism of these transitions is essentially same as that described by Ono et al., but detailed discussions of domain boundaries in this paper gives direct image of manner in which the irregular spin sites arise and leads to a prediction of the similar phenomena in the antiferromagnetic state. It is also proved that the numbers of the extraordinary critical fields are limited to two and five in the ferri- and antiferromagnetic states, respectively. The obtained additional critical fields are H_<c3>=4H_1-2H_2=36.6kOe and H_<c4>=4H_1=41.2kOe in the ferrimagnetic state, which are same as H_c' and H_c" described by One et al. and are in good agreement with the experimental results, and H_<c5>=0,H_<c6>=2H_2=4.6kOe, H_<c7>2H_1=20.6kOe, H_<c8>=2H-2H_2=16.0kOe and H_<c9>=2H_1+2H_2=25.5kOe in the antiferromagnetic state, of which H_<c6> and H_<c7> were observed by this author. The size of the domain is estimated as 0.3μm nsing a simple model. Possibility of spin-cluster resonance at the domain boundaries is also discussed.
社団法人日本物理学会の論文
1973-11-05