FeNHf软磁薄膜中磁各向异性对太赫兹波调控的研究

本文制备了具有磁各向异性的纳米FeNHf软磁薄膜,表征了FeNHf薄膜的微结构、磁性能、微波磁动力学行为和磁各向异性对太赫兹波传输特性的影响。FeNHf薄膜的难轴方向具有410的磁导率,易轴方向没有磁导率信号,磁各向异性场为2537.65 A/m。FeNHf薄膜在1.04 THz时出现了共振吸收峰,当调控磁化强度方向分别于太赫兹波磁场平行和垂直时,共振频率偏移0.03 THz,调谐率为3%。软磁薄膜在太赫兹波段的响应时间处于自旋进动的时间尺度的下限,调控软磁薄膜中磁各向异性场方向使得薄膜在太赫兹波传输方向上折射率发生变化,导致了FeNHf薄膜在太赫兹波段共振频率的改变。

Study on the Terahertz modulation by themagnetic anisotropy in FeNHf soft magnetic film

In this paper,the FeNHf soft magnetic nano-film with the high magnetic anisotropy is fabricated.The influence of microstructures,magnetic performance,microwave magnetic dynamic behaviors and magnetic anisotropy on THz wave transmission properties have been addressed.The permeability of the FeNHf film is 410 in the hard axis and there is no permeability signal in the easy axis.The anisotropic field is 2537.65 A/m.The resonance frequency of the FeNHf film appears at 1.04 THz in the THz transmission curve.The experimental results show that the resonance frequency shifts 0.03 THz and exhibits a tunability of about 3%at the frequency of 1.04 THz,when the direction of the magnetization is parallel and perpendicular to the THz magnetic field,respectively.The response time of the soft magnetic film in the THz region is in the lower limit of the time scale of spin precession.The change of refractive index in the THz transmission is induced by the tunable magnetic anisotropy,which results in the change of the resonance frequency of FeNHf film in the THz region.