Dr. Aviad Frydman

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• Dr. Aviad Frydman
• Condensed matter physics, low dimensional
  systems, mesoscopic and disordered systems.
• tel [phone] fax [phone]
• e-mail frydman_at_mail.biu.ac.il
• http//www.ph.biu.ac.il/fac?id20
• Biography
• B.Sc., Physics and Mathematics, Hebrew University
  (1990) M.Sc., Physics, Hebrew University (1992)
  Ph.D., Physics, Hebrew University (1996)
  Postdoctoral research, University of California,
  San Diego (1996-1999)
• at Bar Ilan University since 1999.
• Research Overview
• Magneto-transport in granular 2D, 1D wires and
  nano-systems of ferromagnets (Ni, Co etc.), low
  dimensional superconductivity, transport
  properties of disordered and granular films,
  nanosized electronic systems.

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Low Dimensional Magnetism
1D magnetic wires
By means of advanced lithography and step-edge
techniques we fabricate narrow magnetic wires.
wire
The wires exhibit unique asymmetric
Magneto-Resistance curves. These features are
sensitive to the applied current and may serve as
a basis for magnetic sensors and transistors
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Low Dimensional Magnetism
Granular ferromagnets
Arrays of Nano-sized magnetic grains are
prepared by quench condensation i.e.,
evaporation of ultra-thin films on cryo-cooled
substrates within the measurement apparatus under
UHV conditions.
The magneto-transport of such systems shows
Giant Magneto-Resistance features accompanied by
positive MR at high magnetic fields
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Low Dimensional Magnetism
Dilute granular samples
Granular samples can be fabricated so that their
transport properties are dominated by a single
nano-grain. These systems show very large sharp
resistance jumps at specific magnetic fields.
These features may be a basis for new, high
density, memory media.
1D granular wires
Similar features are seen in 1D granular
ferromagnets prepared using a combination of
quench-condensation and step-edge techniques.
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Low Dimensional Magnetism
Nano-sized granular ferromanets
By means of AFM lithography we create a nano-gap
between two magnetic electrodes. This structure
is placed in a quench-condensation apparatus and
a nano-granular film is grown between the
electrodes. The MR amplitude increases as the
sample size decreases.