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May 16-17, 2019 | Prague, Czech Republic
2
nd
International Conference on
22
nd
International Conference on
Nanomaterials and Nanotechnology
Advanced Nanoscience and Nanotechnology
Joint Event
&
Journal of Materials Science and Nanotechnology | Volume 3
Mater Sci Nanotechnol, Volume 3
Optimization of the Ni
80
Fe
20
nanoislands growth for sensor technology
Alex Trukhanov, T I Zubar, D I Tishkevich, A A Solobai, D A Vinnil
and
S V Trukhanov
South Ural State University, Russia
N
ickel based alloys have optimal balance of magnetic and
functional properties. The particular interest in quasi-
2D structures near the percolation region for fundamental
investigation and spintronic application is caused by
the demonstration of unique magnetic phenomena like
skyrmions and vortex-antivortex pairs. The use of pulsed
electrodeposition with ultra-short pause duration make it
possible to produce nanocrystalline films with controlled
grain size and may have impact on the mechanism of their
growth. However, the influence of processes, which occur
during the pause between pulses, remains important for
the growth mechanism. We studied occurring processes
during the interpulse relaxation (IPR) time and their influence
on the growth mechanism and the structure of the final
NiFe films. As a result, three types of NiFe films with an
absolutely different structure can be obtained for electrolyte
deposition regimes with a fixed pulse duration and with an
increase in the IPR time due to controlled conglomeration
of nanocrystallines with excess surface energy. So, the
uniform nanocrystalline NiFe film with an average grain size
less than 10 nm was obtained in the short relaxation (SR)
regime (shortest IPR time) of pulsed electrodeposition. The
uniformly distributed fraction of grains conglomerations (40 –
50 nm) surrounded by nanosized grains (less than 10 nm) was
observed using medium relaxation (MR1 and MR2) regimes.
Finally, using large relaxation (LR) regime with the largest IPR
time, separate “islands” with a size about 50 nmwere formed
on the gold sublayer. So, we have shown the possibility of
transition of the growth mechanism from the layer-by-layer
through the layer-plus-island to island formation by varying
only one technological parameter – IPR time. We first showed
the ability to control the mechanism of the NiFe films growth
by controlled nanocrystallites conglomeration during pulsed
electrolyte deposition. This opens broad perspectives for
practical applications of this technology.
e
:
truhanov86@mail.ru