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2015 ; 5
(ä): 16184
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English Wikipedia
Topological, non-topological and instanton droplets driven by spin-transfer
torque in materials with perpendicular magnetic anisotropy and
Dzyaloshinskii-Moriya Interaction
#MMPMID26548898
Carpentieri M
; Tomasello R
; Zivieri R
; Finocchio G
Sci Rep
2015[Nov]; 5
(ä): 16184
PMID26548898
show ga
The interfacial Dzyaloshinskii-Moriya Interaction can modify the topology of
droplets excited by a localized spin-polarized current. Here, we show that, in
addition to the stationary droplet excitations with skyrmion number either one
(topological) or zero (non-topological), there exists, for a fixed current, an
excited mode with a non-stationary time behavior. We call this mode "instanton
droplet", which is characterized by time domain transitions of the skyrmion
number. These transitions are coupled to an emission of incoherent spin-waves
that can be observed in the frequency domain as a source of noise. Our results
are interesting from a fundamental point of view to study spin-wave emissions due
to a topological transition in current-driven systems, and could open the route
for experiments based on magnetoresistance effect for the design of a further
generation of nanoscale microwave oscillators.