Lajos K' Varga

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Lajos K. Varga

• Research Institute of Solid State Physics and
  Optics of
• Hungarian Academy of Sciences

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Proposal full title Amorphous Metal-Insulator
type soft magnetic composites       Proposal
acronym AMINMAG Date of preparation
10.09.2004   Type of Instrument STREP
(Specific Targeted Research project)   Submission
stage OUTLINE proposal   Activity code
addressed NEST-2003-1 ADVENTURE   Duration of
the project 36 months
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(FeSi, FeAl, permalloy) commercialized 100 years
ago (Mn-Zn and Ni-Zn ferrites) commercialized 50
years ago amorphous alloys 25 years ago
nanocrystalline alloys about 10 years
ago Limitations eddy current losses - metals
low temperature limit
ferrites Solution a metal - insulator
nanocomposite -metaferrite Adventure to prove
the theoretical prediction The exchange
interaction can be replaced by the extended
dipolar interaction in averaging out the local
anisotropies and so producing a soft magnetic
material.
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K1 (8-48) 103 J/m3 ltKgt 1-10 J/m3
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• Experimental techniques
• Gas atomizing ferromagnetic bulk amorphous alloy
  (FBA)
• Coating with Mg or Zn by vapor deposition
• and oxidation of Mg or Zn.
• Compaction between Tg and Tx.
• Spray forming of FBA with ZrO or Al2O3
• Plasma spray of FBA with ZrO or Al2O3
• Preparation of composite oxides (e.g.
  Fe(Co)-M-O, where
• M Al, Zn, or Si) by mechanical milling
• cold compaction
• sintering and precipitation of nanosized
  Fe(Co)
• particles by subsequent heat treatment
• Reduction of Fe(Co) nanosized oxide powder in H2
  fluidizing bed
• Coating with Mg or Zn by vapor deposition
• and oxidation of Mg or Zn
• compaction by hot isostatic pressure

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Abstract Bad
The project proposed aims to explore the concept
of novel metal-insulator composite materials
consisting of the active amorphous magnetic
particles embedded in a host insulator matrix,
which are expected to exhibit excellent soft
magnetic properties both at high-frequencies (up
to 1 GHz) and at high temperatures (up to 300-400
oC), thus meeting the needs of modern
telecommunication systems and power electronics.
Good
The proposal aims to realize a scientific and
technological break-through in the field of high
frequency and high temperature soft magnetic
materials developing a new meta- material
consisting of the active amorphous magnetic
particles embedded in a host insulator matrix
making possible new applications in informatics
and power electronics at high-frequencies (up to
1 GHz) and at high temperatures (up to 300-400 oC.
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Bad No interdisciplinarity No industrial
partner No prediction of the economical benefit
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