Title :
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
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2443183
