A new microfocused Brillouin light scattering (BLS) apparatus has been setup using a microscope objective with large numerical aperture and achieving a submicrometric lateral resolution, as inferred by reflectivity measurements taken on a set of calibration arrays consisting of Al stripes with different spacings. The micro-BLS apparatus has been then used to investigate the magnetic normal modes of elliptical Permalloy nanorings. The superiority of micro-BLS over conventional BLS measurements in the detection of stationary modes, especially those localized close to the edges of the nanoring where the internal field is highly nonhomogeneous, is demonstrated. A satisfactory interpretation of the measured spectra in terms of dynamical magnetization distribution inside the rings was achieved by a comparison with the output of dynamical micromagnetic simulations.

Setup of a new Brillouin light scattering apparatus with submicrometric lateral resolution and its application to the study of spin modes in nanomagnets

VAVASSORI, Paolo;
2009

Abstract

A new microfocused Brillouin light scattering (BLS) apparatus has been setup using a microscope objective with large numerical aperture and achieving a submicrometric lateral resolution, as inferred by reflectivity measurements taken on a set of calibration arrays consisting of Al stripes with different spacings. The micro-BLS apparatus has been then used to investigate the magnetic normal modes of elliptical Permalloy nanorings. The superiority of micro-BLS over conventional BLS measurements in the detection of stationary modes, especially those localized close to the edges of the nanoring where the internal field is highly nonhomogeneous, is demonstrated. A satisfactory interpretation of the measured spectra in terms of dynamical magnetization distribution inside the rings was achieved by a comparison with the output of dynamical micromagnetic simulations.
2009
G., Gubbiotti; G., Carlotti; M., Madami; S., Tacchi; Vavassori, Paolo; G., Socino
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA 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/11392/1378525
 Attenzione

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

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 20
social impact