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High frequency and nonlinear phenomena in thin active ferromagnetic planar structures

Abstract : Recently discovered investigations on the high frequency and nonlinear phenomena in thin active ferromagnetic planar structures showed a great number of new studies and promising practical applications. The magnetoelastic energy conversion can be much more efficient in the vicinity of spin reorientation transition (SRT). The thin active ferromagnetic planar structures provide a lot of unique high frequency features: for instance, the anomalous Doppler effect conditions can be satisfied. The magnon crystals are also an actual area for the further investigation of the domain.In the present work we derived the theoretical description for the high frequency and non-linear waves propagation in thin planar ferromagnetic structures with different compositions. It was demonstrated experimentally and theoretically that LF vibrations of the cantilever can be amplified when FMR is excited by HF electromagnetic field near SRT. Moreover the magnetoelastic demodulation effect can be supplemented with nonlinear magnetoelectric effect. The possibility of the occurrence of the anomalous Doppler effect during propagation of an MSSW in an FDM structure in a certain range of system parameters is substantiated. The dispersion of a surface magnetostatic wave propagating in a film, whose thickness varies linearly, with a periodic structure in the form of parallel etched strips was calculated. As it was clearly demonstrated these works are of great interest for the new studies and practical applications
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Submitted on : Friday, October 12, 2012 - 3:02:10 PM
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Yury Ignatov. High frequency and nonlinear phenomena in thin active ferromagnetic planar structures. Other. Ecole Centrale de Lille; Moscow Institute of Physics and Technology (Moscou), 2012. English. ⟨NNT : 2012ECLI0013⟩. ⟨tel-00741407⟩

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