Magnetization Process of the Screw Spin Structure with Orthorhombic Anisotropy Energy

概要

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Modifications of the screw spin structure due to external magnetic field and orthorhombic anisotropy energy at absolute zero are studied based on the model offered by Nagamiya, Nagata and Kitano. External magnetic field is applied along the easy axis of the in-plane anisotropy energy. When the anisotropy constant in the plane perpendicular to the screw axis is not zero, a ferrimagnetic Ising state, in which spins on one sublattice are down and those on two sublattices are up, becomes stable near cos q_0=-1/2 in intermediate field, where q_0 is the turn angle of the screw. A ferrimagnetic fan state, which is a modification of the ferrimagnetic Ising state, is stable near cos q_0=-3/4 in slightly lower field. Near cos q_0=-1/2 two kinds of triangular state are seen to be stable. It is also shown that a four sublattice state such as ⇈⇊ and a hexa-angular arrangement of spins are stable near cos q_0=0 and 1/2, respectively, for weak field.
社団法人日本物理学会の論文
1968-12-05