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Origin of spectral purity and tuning sensitivity in a vortex-based spin transfer nano-oscillator | | A. Hamadeh
; Grégoire De Loubens
; Olivier Klein
; V. V. Naletov
; Romain Lebrun
; Nicolas Locatelli
; Julie Grollier
; Vincent Cros
; | | Date: |
18 Oct 2013 | | Abstract: | We investigate the microwave characteristics of a spin transfer
nano-oscillator (STNO) based on coupled vortices as a function of the
perpendicular magnetic field $H_perp$. While the generation linewidth displays
strong variations on $H_perp$ (from 40 kHz to 1 MHz), the frequency tunability
in current remains almost constant (~7 MHz/mA). We demonstrate that our
vortex-based oscillator is quasi-isochronous independently of $H_perp$, so
that the severe nonlinear broadening usually observed in STNOs does not exist.
Interestingly, this does not imply a loss of frequency tunability, which is
here governed by the current induced Oersted field. Nevertheless this is not
sufficient to achieve the highest spectral purity in the full range of
$H_perp$ either: we show that the observed linewidth broadenings are due to
the excited mode interacting with a lower energy overdamped mode, which occurs
at the successive crossings between harmonics of these two modes. These
findings open new possibilities for the design of STNOs and the optimization of
their performance. | | Source: | arXiv, 1310.4913 | | Services: | Forum | Review | PDF | Favorites | |
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