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Title: Vortex Nucleation Phase in Spin Torque Oscillators Based on Nanocontacts
Authors: Devolder, Thibaut ×
Kim, Joo-Von
Petit-Watelot, S
Otxoa, R
Chappert, Claude
Manfrini, Mauricio
Van Roy, Wim
Lagae, Liesbet #
Issue Date: Jun-2011
Publisher: Published by the Institute of Electrical and Electronics Engineers for the Magnetics Group
Series Title: IEEE Transactions on Magnetics vol:47 issue:6 pages:1595-1598
Abstract: 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.
ISSN: 0018-9464
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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