A theoretical model of the Brillouin light scattering Stokes/anti-Stokes intensity asymmetry of spin modes as a function of the applied magnetic field in thin magnetic multilayers has been developed. We have firstly studied a single ferromagnetic film of Fe and then we have extended the analysis to the case of ferromagnetic Fe/Cu bilayers ferromagnetically coupled and Fe/Cr multilayers with antiferromagnetic coupling including systems with geometrical asymmetry. The thickness of the Fe films is in the range between 20 Å and 100 Å. In the case of the single Fe film we have been able to reproduce the first oscillation of the Stokes/anti-Stokes intensity asymmetry experimentally observed in permalloy films. We have also found that the ellipticity, i.e. the ratio between the absolute value of the in-plane and of the out-of-plane component of the dynamic magnetization, of the optical spin modes is not affected by the external magnetic field. An excellent agreement is found when comparing the prediction of our model with a set of experimental Brillouin light scattering spectra. -- Presentazione poster by R. Zivieri -Conferenza nazionale
Stokes-anti-Stokes Brillouin intensity asymmetry of spin modes in thin ferromagnetic multilayers -- Presentazione poster by R. Zivieri - Conferenza nazionale
ZIVIERI, Roberto;GIOVANNINI, Loris;NIZZOLI, Fabrizio;VAVASSORI, Paolo;
2001
Abstract
A theoretical model of the Brillouin light scattering Stokes/anti-Stokes intensity asymmetry of spin modes as a function of the applied magnetic field in thin magnetic multilayers has been developed. We have firstly studied a single ferromagnetic film of Fe and then we have extended the analysis to the case of ferromagnetic Fe/Cu bilayers ferromagnetically coupled and Fe/Cr multilayers with antiferromagnetic coupling including systems with geometrical asymmetry. The thickness of the Fe films is in the range between 20 Å and 100 Å. In the case of the single Fe film we have been able to reproduce the first oscillation of the Stokes/anti-Stokes intensity asymmetry experimentally observed in permalloy films. We have also found that the ellipticity, i.e. the ratio between the absolute value of the in-plane and of the out-of-plane component of the dynamic magnetization, of the optical spin modes is not affected by the external magnetic field. An excellent agreement is found when comparing the prediction of our model with a set of experimental Brillouin light scattering spectra. -- Presentazione poster by R. Zivieri -Conferenza nazionaleI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
