2011 - Europe Direct Iasi

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R.20.
Title
Authors
Institution
Description
EUROINVENT 2011
D. Pinzaru (Tanase) a , S. I. Tanase a,b , A. V. Sandu c , V.
Georgescu a
a Faculty of Physics, “Al. I. Cuza” University, Blvd. Carol I,
No.11, 700506 Iasi, Romania
b “Alexandru Cel Bun” College, Gura Humorului, Romania
c Faculty of Materials Science and Engineering, “Gheorghe
Asachi” Technical University, Iasi,
We report in this study on the structural, magnetic and
magnetoresistance properties of [Fe/Pt] n granular multilayers.
These films may be interesting for hard-magnetic applications
with low cost, including microelectromechanical systems. With
this purpose, granular [Fe/Pt]n multilayers with different bi-layer
thicknesses (in the range 3.5-15.0 nm) have been
electrodeposited potentiostatically on polycrystalline copper
substrate by a single bath technique. The magnetic properties of
[Fe (t Fe nm)/Pt (t Pt nm)] n multilayers were influenced by both the
thickness of the Fe (t Fe) or Pt (t Pt) layers and the number (n) of
bi-layers. The coercivity varied between 8 and17 kA·m -1 and the
remanence ratio was M r/M s = 0.23 ÷ 0.81. Moreover, the uniaxial
out of plane magnetic anisotropy and the shape of the hysteresis
loops were dependent on the multilayer features. The [Fe/Pt] n
electrodeposited multilayers display magnetoresistance effect
(with a maximum value of 23%) due to spin-dependent
scattering of the conduction carriers within the magnetic layers
or at the boundaries of the magnetic layers and to the exchange
interaction between neighboring layers. It was found that the
giant magnetoresistance of these multilayers increased almost
linearly with increase in the number of bi-layers. This result
confirms that the number of bi-layers play a significant role in
magnetoresistance and magnetic behavior of [Fe/Pt]n multilayers.
Research on Co-Ni-N thin films prepared by magnetoelectrolysis,
for tunnelling magnetoresistance applications
S. I. Tanase a,b , D. Pinzaru (Tanase) a , A. V. Sandu c , V.
Georgescu a
a Faculty of Physics, “Al. I. Cuza” University, Iasi, Romania
b “Alexandru Cel Bun” College, Gura Humorului, Romania
c Faculty of Materials Science and Engineering, “Gheorghe
Asachi” Technical University, Iasi, Romania
The surface morphology, magnetic and magneto-transport
properties of Co-Ni-N alloys thin films electrodeposited under
external magnetic field (by magneto-electrolysis) were
investigated in this work. The films were electroplated on Al
substrates using an original bath working with the same
electrodeposition parameters for all experiments, but
Innovative Researches
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