Quantum oscillations in small magnetic particles

Abstract

Quantum oscillations in small magnetic particles, induced by external magnetic field, are considered. It is shown that, due to tunneling of the total magnetization ${\mathit{M}}_0$, the ground-state energy of the system oscillates as a function of the external-magnetic-field strength with period δH=(μ/${\mathit{M}}_0$)${\mathit{H}}_{\mathit{c}}$ (μ is the magnetic moment; ${\mathit{H}}_{\mathit{c}}$ is the coercive field). In small anisotropic antiferromagnetic particles, the magnetic field enhances the Ne´el-vector tunneling rate and generates oscillations in the soliton rest energy.