Study on relatively large response of rectifying voltage in Ni wires fabricated on a LiNbO_3 substrate

摘要

The rectifying electric ferromagnetic resonance spectroscopy was performed to examine the magnetization dynamics in the stripe magnetic domain structure induced by the competition between shape and heterojunction-induced magnetic anisotropy. The observed angle dependence is in good agreement with the analytical calculations based on the macro-spin model when the applied magnetic field is larger than the effective magnetic anisotropy field. When the external magnetic field is smaller than the threshold field at which destroys the stripe domain structure is destroyed, a large rectifying amplitude is generated in a Ni wire aligned perpendicular to thex-axis of the substrate. The relatively large response is attributed to that the coupled oscillations of the stripe domains. In addition, the Gilbert damping factor is found to be enhanced in the system because of stripe domain structure formation and strain-induced modulation.