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11.07.2016
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Investigation of spin-dependent effects in conductivity of magnetic point
contacts Staff:
| Bashlakov
D.L. |
bashlakov at ilt.kharkov.ua |
|
Naidyuk Yu.G. |
naidyuk at ilt.kharkov.ua
|
Main research:
- observation
and
investigation
peculiarities of
the
electron
transport
in
normal
metal−ferromagnetic
and
normal
metal−ferromagnetic−antiferromagnetic
nano-sized
contacts, which are
connected
with
effects of
the
electron
spin
momentum
transmission;
- finding
of
influence of
flow current regime,
thickness of ferromagnetic
layer and exchange
displacement
effect
on the
effect of
the spin momentum transmission
in nano-sized
contacts with
ferromagnetics;
-
study of
high-frequency
irradiation effect
and
search
for the
resonance
absorption of
electromagnetic
high-frequency
waves for
above-noted structures.
Main results:
 Spin-valve
structure
can be
formed
on
atomic
scale using
the method of point-contact spectroscopy.
It was found, that an atomically-sized
surface
ferromagnetic
layer,
which
has
weaken
exchange
interaction
with
a bulk,
plays role
of a
spin-valve.
New
stable state
of
surface
spin-valve
effect
in
nano-contacts with
ferromagnetic
was observed.
This state
is
connected
with
a formation of magnetic vortex due to
oersted
magnetic field
of
high density transport current
in
the contact.
Exchange
bias
effect on
the
magnetoresistance
of
nano-sized point contacts
between a normal metal and
a
Co-film contacting to an
antiferromagnet
was observed.
Such
effect becomes stronger
with
decreasing
of
the film
thickness.
The resonant
magnetization precession induced by the HF electromagnetic field was discovered
in the surface spin valve.
Equipment:
The point-contact spectrometer
for investigation
of nonlinear conductivity of contacts. Such spectrometer
has a cryogenic
equipment for creation of point-contacts and measuring of
conducting properties of
point contacts
in temperature
interval 1.5-77 K, magnetic field
range 0-6T
and
under
high-frequency
irradiation in the range 4 - 65
GHz.
International
collaboration:
-
Chalmers University of Technology, Geteborg, Sweden
-
Kamerlingh Onnes Laboratory, Leiden, The Netherlands
-
Physical
Department University of Konstanz, Germany
- Royal Institute of Technology, Stockholm, Sweden
Last main publications:
-
Yu. G. Naidyuk, O. P.
Balkashin, V. V. Fisun, I. K. Yanson, A. Kadigrobov, R. I. Shekhter, M.
Jonson, V. Neu, M.Seifert, S. Andersson and V. Korenivski, Stimulated
emission and absorption of photons in magnetic point contacts,
New Journal of Physics,
2012, Vol.14, p. 093021.
-
A. M. Kadigrobov, R. I.
Shekhter, S. I. Kulinich, M. Jonson, O. P. Balkashin, V. V. Fisun, Yu. G.
Naidyuk, I. K. Yanson, S. Andersson, V. Korenivski,
Hot
electrons in magnetic point contacts as a photon source,
New Journal of Physics,
2011, Vol.13, p. 023007.
-
I.
K.
Yanson,
Yu. G. Naidyuk,
O.
P.
Balkashin,
V.
V.
Fisun,
L.
Yu.
Triputen,
S. Andersson,
V.
Korenivski, Y. I. Yanson, H.
Zabel,
Spin
Torques in Point Contacts to Exchange-Biased Ferromagnetic Films,
IEEE
Transactions on Magnetics, 2010, Vol.
46, p. 2094.
-
I. K. Yanson, V. V. Fisun,
Yu. G. Naidyuk, O. P. Balkashin, L. Yu. Triputen, A. Konovalenko and V.
Korenivski, Current
driven tri-stable resistance states in magnetic point contacts.
J.
Phys.: Condens.Matter,
2009, Vol.21, ð.355004.
-
O. P. Balkashin, V. V.
Fisun, I. K.Yanson, L. Yu.Triputen, A. Konovalenko,
V. Korenivski,
Spin dynamics in point contacts to single ferromagnetic films, Physical
Review B,
2009, Vol.79,
р.
092419.
-
I. K. Yanson,
Yu. G. Naidyuk, V. V. Fisun, A. Konovalenko, O. P. Balkashin, L. Y. Triputen,
and V. Korenivski,
Surface Spin-Valve Effect,
Nano Letters,
2007, Vol. 7,
р.927.
-
I. K. Yanson, Yu. G.
Naidyuk, D. L. Bashlakov, V.V. Fisun, O. P. Balkashin, V. Korenivski, A.
Konovalenko, and R. I. Shekhter, Spectroscopy of Phonons and Spin Torques in
Magnetic Point Contacts,
Physical Review Letters,
2005, Vol.95,
р.
186602.
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