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  • During recent years a great interest has been paid to multiferroic materials in which magnetic and ferroelectric orders not only coexist but are coupled. Magnetoelectrics attract attention primarily because of their potential technical applications in electronics. But materials that are both ferroelectric and magnetic are rare and only a part of them exhibits significant coupling between magnetic and electric order parameters. The challenge for basic and material research is to understand physical fundamentals of mechanisms responsible for the magneto-electric phenomena and to predict succesfully new or modified materials with suitable technological parameters. The known single phase multiferroics are mostly transition metal oxides. The magneto-electric effects have been observed for instance in some manganite or iron perovskites. Hexagonal ferrite of Y-type (Ba1-xSrx)2Zn2Fe12O22 is a new promising magnetoelectric system in which the existence of electric polarization is conditioned by the noncollin (en)
  • Získat nové poznatky o magnetoelektrických vlastnostech vybraných oxidů přechodových kovů a o jejich závislosti na technologii přípravy a tepelných úpravách vzorků. Vysvětlit experimentálně pozorované jevy na základě teoretických výpočtů.
Title
  • Preparation, characterization and understanding of magnetoelectric transition metal oxides (en)
  • Příprava, charakterizace a výklad vlastností magnetoelektrických oxidů přechodových kovů
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  • ME08059
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  • magnetism; ferroelectricity; magnetoelectric phenomenon; multiferroics; transition metal oxides; ab initio calculations; electron structure; hexaferrites (en)
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  • Projekt byl zaměřen na přípravu a charakterizaci monokrystalických a polykrystalických hexaferitů typu Y. Bylo prokázáno, že magnetoelektrické vlastnosti lze ovlivňovat vhodnými tepelnými úpravami vzorků. K metodickým přínosům patří postupy pro určení parametrů distribuce kationtů Zn a Fe v tetraedrických pozicích a kyslíkové stechiometrie. (cs)
  • The project was devoted to preparation and characterization of single crystals and polycrystalline Y-type hexaferrites. It was proved that their magnetoelectric properties can be influenced by proper temperature treatment. Methods for determination of distribution of Zn and Fe cations on tetrahedral sites and oxygen stoichiometry were accomplished. (en)
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  • magnetism
  • ab initio calculations
  • ferroelectricity
  • multiferroics
  • transition metal oxides
  • electron structure
  • magnetoelectric phenomenon
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