Magnetic domain dynamics in an insulating quantum ferromagnet

Article

关键词: AVALANCHES;    MODEL;    TRANSITION;    CRYSTALS;    LIHOF4;   

DOI  :  10.1103/PhysRevB.100.134405

来源: SCIE

【 摘 要 】

The statistics and form of avalanches in a driven system reveal the nature of the underlying energy landscape and dynamics. In conventional metallic ferromagnets, eddy-current back action can dominate the dynamics. Here, we study Barkhausen noise in Li(Ho,Y)F-4, an insulating Ising ferromagnet that cannot sustain eddy currents. For large avalanches at temperatures approaching the Curie point, we find a symmetric response free of drag effects. In the low-temperature limit, drag effects contribute to the dynamics, which we link to enhanced pinning from local random fields that are enabled by the microscopic dipole-coupled Hamiltonian (the Ising model in transverse field).

【 授权许可】

Free