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2009 | 115 | 1 | 357-359
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Exchange Bias in Iron-Oxide Particles Nanocasted in Periodic Porous Silica

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Iron-oxide nanoparticles were nanocasted in the periodic mesoporous silica matrix, consisting of two-dimensional hexagonally ordered channel system with the mean diameter of the channels about 7 nm. The magnetic measurements of dc magnetization confirm behavior typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, presence of a maximum in zero-field-cooled curve related with blocking temperature T_C and revealing of coercivity H_C below T_C. The existence of negative exchange bias effect below T_C was confirmed in our system represented by value of exchange bias field H_{EB}=-970 Oe measured at the temperature 2 K.
  • Department of Solid State Physics, University of P.J. Šafárik, Park Angelinum 9, 041 54 Košice, Slovakia
  • Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
  • Department of Inorganic Chemistry, University of P.J. Šafárik, Moyzesova 51, 041 54 Košice, Slovakia
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