We present a theoretical study of the quantized spin wave spectrum in tangentially magnetized cylindrical thin magnetic dots. Low energy spin waves in magnetic dots may be subdivided into four families: Damon-Eshbach-like, backward-like, mixed and end modes. Frequencies and mode profiles are found using a variational approach based on carefully chosen trial functions [1]. Results for small dots generated using the variational method compare well both with micromagnetic results [2] and with available Brillouin Light Scattering data from saturated thin cylindrical Permalloy dots. Our approach allows for the definition of parameters describing important contributions to the spin wave energies. As an example, we show that a variational parameter epsilon provides a measure of spin wave localization near the dot borders for end modes. [1] R. Zivieri and R.L. Stamps Phys. Rev. B 73, 144422 (2006). [2] L. Giovannini, F. Montoncello, F. Nizzoli, G. Gubbiotti, G. Carlotti, T. Okuno, T. Shinjo, and M. Grimsditch Phys. Rev. B 70 (2004) 172404. -- Presentazione poster by R. Zivieri - Conferenza internazionale
Theory of spin wave modes in tangentially magnetized thin cylindrical dots: a variational approach -- Presentazione poster by R. Zivieri - Conferenza internazionale
ZIVIERI, Roberto
2006
Abstract
We present a theoretical study of the quantized spin wave spectrum in tangentially magnetized cylindrical thin magnetic dots. Low energy spin waves in magnetic dots may be subdivided into four families: Damon-Eshbach-like, backward-like, mixed and end modes. Frequencies and mode profiles are found using a variational approach based on carefully chosen trial functions [1]. Results for small dots generated using the variational method compare well both with micromagnetic results [2] and with available Brillouin Light Scattering data from saturated thin cylindrical Permalloy dots. Our approach allows for the definition of parameters describing important contributions to the spin wave energies. As an example, we show that a variational parameter epsilon provides a measure of spin wave localization near the dot borders for end modes. [1] R. Zivieri and R.L. Stamps Phys. Rev. B 73, 144422 (2006). [2] L. Giovannini, F. Montoncello, F. Nizzoli, G. Gubbiotti, G. Carlotti, T. Okuno, T. Shinjo, and M. Grimsditch Phys. Rev. B 70 (2004) 172404. -- Presentazione poster by R. Zivieri - Conferenza internazionaleI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
