Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3478843
Keywords
cobalt alloys; copper; ferromagnetic materials; iridium alloys; iron alloys; magnetic multilayers; magnetoelectronics; manganese alloys; nanocontacts; nanomagnetics; nucleation; oscillations; Permalloy; spin valves
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Funding
- Triangle de la Physique [2007-051T]
- European Community [MRTN-CT-2006-027]
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We present an experimental study of the nucleation rate associated with current-driven vortex oscillations in magnetic nanocontacts. We find that the nucleation and subsequent steady-state oscillation of a vortex can be initiated using current pulses as short as a few nanoseconds, yielding instant on oscillator capability. The nucleation rate is governed by an Arrhenius law, with an exponential dependence on the applied current magnitude. The mechanism for the vortex nucleation is discussed and compared to analytical estimates assuming the transient presence of a vortex-antivortex pair. (C) 2010 American Institute of Physics. [doi:10.1063/1.3478843]
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