The spin dynamics of thin film Permalloy individual rings in the circulating state is studied in the presence of an in-plane bias field and in response to a transient field applied perpendicular to the ring plane. Only one dominant precessional mode is observed in the remanence state, which corresponds to an angularly uniform excitation. In contrast, when an external bias field is applied, multiple precessional modes are observed, with the number of modes increasing as the field increases. The static magnetic field distorts the circular symmetry of the initial magnetization state. As a result, the precessional torque produced by the pulsed field is inhomogeneous, which promotes the excitation of higher order azimuthal modes.

Observation of azimuthal ferromagnetic resonance modes in 1.0 micron diameter Permalloy rings

GIOVANNINI, Loris;MONTONCELLO, Federico;NIZZOLI, Fabrizio;
2006

Abstract

The spin dynamics of thin film Permalloy individual rings in the circulating state is studied in the presence of an in-plane bias field and in response to a transient field applied perpendicular to the ring plane. Only one dominant precessional mode is observed in the remanence state, which corresponds to an angularly uniform excitation. In contrast, when an external bias field is applied, multiple precessional modes are observed, with the number of modes increasing as the field increases. The static magnetic field distorts the circular symmetry of the initial magnetization state. As a result, the precessional torque produced by the pulsed field is inhomogeneous, which promotes the excitation of higher order azimuthal modes.
2006
X., Zhu; Z., Liu; V., Metlusko; Giovannini, Loris; Montoncello, Federico; Nizzoli, Fabrizio; M. R., Freeman
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516804
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact