测量了FeCo薄膜在0.5~8 GHz频率范围内的复数磁导率谱，通过改变外加磁场 H ex 的方向、大小，研究磁导率虚部共振曲线出现的磁滞现象。验证了样品铁磁共振频率f r 的平方值随正向H ex 线性变化的规律；观察到 H ex 与样品磁化方向相反时，共振曲线的磁滞现象，尤其是 H ex 的值接近矫顽力H c时，共振曲线出现双峰，反映了铁磁薄膜中部分磁矩随着反向H ex 逐渐增大逐步翻转的磁化动力学过程。由铁磁共振公式拟合磁谱虚部曲线，计算了双共振峰出现时薄膜中磁矩发生翻转的比例。
The dynamic magnetic properties of a 200-nm-thick FeCo film had been surveyed through permeabili-ty measurements in the frequency range of 0.5 to 8 GHz,within a magnetic field applied in the easy magnetic direction.When the external field was inversed with the orientation of the magnetization,the increase of the field leads to the decrease of the resonance frequency according to the magnetic hysteresis that shown in the fer-romagnetic films.The phenomenon can be explained by ferromagnetic resonance equations and the ratio of mag-netic moments in the opposite directions has been calculated.
参考文献
| [1] | Ebels U;Buda L D;Ounadjela K.Small amplitude dynamics of nonhomogeneous magnetization distribu-tions:the excitation spectrum of stripe domains[A].Heidelberg:Springer,2002:167-216. |
| [2] | Robert L. Stamps .Dynamic Magnetic Properties of Ferroic Films, Multilayers, and Patterned Elements[J].Advanced functional materials,2010(15):2380-2394. |
| [3] | Beaurepaire E;Merle J C;Daunois A et al.Ultra-fastspin dynamics in ferromagnetic nickel[J].Physical Review Letters,1996,76:4250-4253. |
| [4] | Urban R.;Heinrich B.;Woltersdorf G. .Gilbert damping in single and multilayer ultrathin films: Role of interfaces in nonlocal spin dynamics - art. no. 217204[J].Physical review letters,2001(21):7204-0. |
| [5] | Acher O.;Queste S.;Ledieu M.;Barholz KU.;Mattheis R. .Hysteretic behavior of the dynamic permeability on a Ni-Fe thin film - art. no. 184414[J].Physical review, B. Condensed matter and materials physics,2003(18):4414-0. |
| [6] | Ding Y;Klemmer TJ;Crawford TM .A coplanar waveguide permeameter for studying high-frequency properties of soft magnetic materials[J].Journal of Applied Physics,2004(5):2969-2972. |
| [7] | Boone C T;Katine J A;Childress J R et al.Resonant nonlinear damping of quantized spin waves in ferromag-netic nanowires:a spin torque ferromagnetic resonance study[J].Physical Review Letters,2009,103:167601. |
| [8] | V. Bekker;K. Seemann;H. Leiste .A new strip line broad-band measurement evaluation for determining the complex permeability of thin ferromagnetic films[J].Journal of Magnetism and Magnetic Materials,2004(3):327-332. |
| [9] | Smit J;Beljers H G .Ferromagnetic resonance absorption in BaFe12 O19,a high anisotropy crystal[J].Phillips Research Reports,1955,10:113-130. |
| [10] | Chen Xin;Ma Yungui;Ong C K .Magnetic anisotropy and resonance frequency of patterned soft magnetic strips[J].Journal of Applied Physics,2008,104:013921. |
| [11] | Acher O;Dubourg S .Generalization of Snoek's law to ferromagnetic films and composites[J].Physical review, B. Condensed matter and materials physics,2008(10):104440-1-104440-11-0. |
| [12] | Bergman D J;Stroud D .Physical properties of macro-scopically inhomogeneous media[J].SOLID STATE PHYSICS-ADVANCES IN RESEARCH AND APPLICATIONS,1992,46:147-269. |
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