Details

Autor(en) / Beteiligte

• Devolder, T.
• Kim, Joo-Von
• Petit-Watelot, S.
• Otxoa, R.
• Chappert, C.
• Manfrini, M.
• Van Roy, W.
• Lagae, L.

Titel

Vortex Nucleation Phase in Spin Torque Oscillators Based on Nanocontacts

Ist Teil von

• IEEE transactions on magnetics, 2011-06, Vol.47 (6), p.1595-1598

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2011

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• We study the starting up phase of a current-controlled oscillator based on a magnetic vortex orbiting around a nanocontact in a spin-valve. From the idle state, current pulses down to a few nanoseconds can create the vortex, which is detected through the electrical signature of its steady-state gyration. Two ns are needed to reach the in-current equilibrium. The process can then be described by an Arrhenius law, with an activation energy that is consistent with the Oersted-field-induced separation of a vortex-antivortex pair. Requirements for deterministic nucleation are deduced, with prospects for instant-on oscillator capability.