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Lajos K. Varga

Lajos K. Varga. Research Institute of Solid State Physics and Optics of Hungarian Academy of Sciences. Proposal full title: Amorphous Metal-Insulator type soft magnetic composites Proposal acronym: AMINMAG Date of preparation: 10.09.2004

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Lajos K. Varga

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  1. Lajos K. Varga Research Institute of Solid State Physics and Optics of Hungarian Academy of Sciences

  2. 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

  3. (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.

  4. K1 ~ (8-48) 103 J/m3 <K> ~ 1-10 J/m3

  5. 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

  6. 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.

  7. Bad: No interdisciplinarity No industrial partner No prediction of the economical benefit

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