Spin Waves Modes in Cobalt Nanowires Arrays

Author

Trabada, D.G. ; Roussigne, Y. ; Cherif, S.M. ; Stashkevich, A.A. ; Belmeguenai, M. ; Vazquez, M.

Author_Institution

Inst. de Cienc. de Mater. de Madrid, Madrid, Spain

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

Cobalt nanowires (NWs) of 40-50 nm average diameter and several micrometers in length were elaborated by electrodeposition process in alumina templates. X-ray diffraction measurements show that all the NWs present a heterogeneous crystalline structure with hcp phase that can be tuned by an appropriate choice of the electrolyte pH. A complex evolution of the magnetic coercivity and squareness with pH is observed in connection with that of the hcp c-axis of the crystalline structure. The spin waves (SWs) propagating into the NWs were investigated by means of the Brillouin light scattering technique. A detailed analysis of the SW spectra allows the identification of dipolar and exchange nature modes propagating within the NWs. Their frequency behavior is successfully described by means of analytical models.

Keywords

Brillouin spectra; X-ray diffraction; cobalt; coercive force; crystal structure; electrodeposition; exchange interactions (electron); magnetic hysteresis; nanofabrication; nanomagnetics; nanowires; pH; spin waves; Al₂O₃; Brillouin light scattering; Co; X-ray diffraction; alumina templates; cobalt nanowires arrays; dipolar nature modes; electrodeposition; electrolyte pH; exchange nature modes; frequency behavior; hcp c-axis; hcp phase; heterogeneous crystalline structure; magnetic coercivity; spin waves modes; squareness; Anisotropic magnetoresistance; Magnetic fields; Magnetic hysteresis; Magnetization; Nanowires; Perpendicular magnetic anisotropy; Brillouin light scattering; Brillouin light scattering (BLS); Cobalt Nanowires; Magnetization dynamics; cobalt nanowires (NWs); magnetization dynamics;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2443183

Filename

7120152