Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00199 : Spin-transfer induced vortex dynamics with non-standard angular dependence torque
Author:
Microwave emissions driven by spin-transfer were firstly
observed on FeNi/Cu/FeNi pillars (standard samples) characterized
by uniform magnetization. Interestingly, by tuning the spin
accumulation profile, i.e., choosing Co/Cu/FeNi pillars with
opportune ratio of thickness/spin diffusion length (non-standard
samples), it is possible to obtain strong modification of the
torque angular dependence and, more generally, of the
magnetization dynamics itself. Eventually, oscillations at zero
applied field were observed for these non-standard pillars, again
for uniform magnetization. However, when a large current density
is applied, the uniform hypothesis is broken and vortex states
are favoured. In this work we want to stress that non
standard-angular dependence, obtained for such Co/Cu/FeNi
samples, plays an important role also for vortex dynamics. By the
combined study of static and dynamic response, we can
discriminate among all possible combinations of vortex
chiralities and polarities. The evolution with field and current
of such configurations clearly differs from samples with standard
spin-torque angular dependence,
resulting in a different dynamics for such non-standard samples.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.199
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