Vortex nucleation in spin-torque nanocontact oscillators
2010; American Institute of Physics; Volume: 97; Issue: 7 Linguagem: Inglês
10.1063/1.3478843
ISSN1520-8842
AutoresT. Devolder, Joo-Von Kim, Mauricio Manfrini, W. Van Roy, Liesbet Lagae, C. Chappert,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoWe 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.
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