应力场对多层膜Permalloy/Cu/Co/NiO铁磁共振性质影响的理论研究

采用能量极小原理研究了Permalloy(Py)/Cu/Co/Ni O多层膜结构中层间耦合强度和应力各向异性场对薄膜共振频率的影响,得到共振频率随外磁场强度变化关系式.结果发现外应力场强度和方向对系统共振频率的影响在本文中要强于层间耦合强度和交换各向异性场,外应力场方向对光学模共振频率的影响强于声学模,而外应力场强度对声学模共振频率的影响强于光学模.

Ferromagnetic Resonance Property of Py/Cu/Co/NiO multilayer structures

Abstract: The ferromagnetic resonant (FMR) frequency in Py/Cu/Co/NiO multilayer structures with intensity of interlayer coupling and stress anisotropy has been studied by using the principle of minimal energy. It is found that the FMR frequencies of optical mode and acoustic mode all increase with the increasing external magnetic field. The stress field intensity and direction are more important for FMR frequency of the system than the interlayer coupling and the exchange anisotropy field. Furthermore, the influence of external stress field direction on the FMR frequencies for the optical mode is stronger than the acoustic mode. On the contrary, the dependence of the FMR frequencies for the acoustic mode on stress field intensity is larger.