Effect of Interlayer Coupling and out of Plane Anisotropy on Resonance Frequencies in Ferromagnetic Bilayer Films
The effect of bilinear coupling,biquadratic coupling and out of plane uniaxial anisotro-py on ferromagnetic resonance frequency in ferromagnetic bilayer films with fixed in-plane uniaxial anisotropy is investigated using the principle of minimal energy.The bilinear coupling,biquadratic coupling and out of plane uniaxial anisotropy dependence of resonance frequencies of optical modes and acoustic modes are discussed from three aspects.It is shown that resonance frequency can be enhanced by considering of bilinear coupling and biquadratic coupling.However,the resonance fre-quency of an optical mode and an acoustic mode can be reduced by out of plane uniaxial anisotropy,especially for an acoustic mode.Moreover,the biquadratic coupling is more important than the bilin-ear coupling for an optical mode.These results may be useful in designing new microwave devices.
bilinear couplingbiquadratic couplingout of plane uniaxial anisotropyferromag-netic resonance
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