铁磁和反铁磁双层膜中铁磁共振的研究

采用微磁学理论研究了铁磁/反铁磁双层膜中的铁磁共振现象.本模型将铁磁薄层抽象为一个单晶,具有立方磁晶各向异性和单轴磁晶各向异性,而反铁磁层视为厚度趋近于半无穷,且只有单轴磁晶各向异性.推导出了该系统的铁磁共振频率和频率谱宽度的解析式.数值计算表明,铁磁共振模式分两支,取决于立方磁晶各向异性.而界面的交换耦合,是磁易轴具有单向性的起因.

Ferromagnetic resonance in ferromagnetic/antiferromagnetic

Based on a simple micromagnetic approach, in plane ferromagnetic resonance for ferromagnetic (FM)/Antiferromagnetic (AFM) bilayers is studied. The thin FM film is taken to be a single crystal with cubic and uniaxial magnetocrystalline anisotropies, while the AFM film has only single uniaxial magnetocrystalline anisotropy. In the semi infinite approximation for the AFM layer, the analytical experessions have been derived for resonance field. Numerical calculations show that there are two different branches of ferromagnetic resonance modes, which depend on the cubic magnetocrystalline anisotropy, and the origin of unidirectional anisotropy results from the exchange coupling of FM/AFM interface.