M Drofenik

Publications (2)4.52 Total impact

• Article: Exchange bias in bulk layered hydroxylammonium fluorocobaltate (NH₃OH)₂CoF₄.

  Z Jagličić, M Zentková, M Mihalik, Z Arnold, M Drofenik, M Kristl, B Dojer, M Kasunič, A Golobič, M Jagodič
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  ABSTRACT: The magnetic properties of layered hydroxylammonium fluorocobaltate (NH(3)OH)(2)CoF(4) were investigated by measuring its dc magnetic susceptibility in zero-field-cooled (ZFC) and field-cooled (FC) regimes, its frequency dependent ac susceptibility, its isothermal magnetization curves after ZFC and FC regimes, and its heat capacity. Effects of pressure and magnetic field on magnetic phase transitions were studied by susceptibility and heat capacity measurements, respectively. The system undergoes a magnetic phase transition from a paramagnetic state to a canted antiferromagnetic state exhibiting a weak ferromagnetic behavior at T(C) = 46.5 K and an antiferromagnetic transition at T(N) = 2.9 K. The most spectacular manifestation of the complex magnetic behavior in this system is a shift of the isothermal magnetization hysteresis loop in a temperature range below 20 K after the FC regime-an exchange bias phenomenon. We investigated the exchange bias as a function of the magnetic field during cooling and as a function of temperature. The observed exchange bias was attributed to the large exchange anisotropy which exists due to the quasi-2D structure of the layered (NH(3)OH)(2)CoF(4) material.
  Journal of Physics Condensed Matter 02/2012; 24(5):056002. · 2.55 Impact Factor
• Article: Preparation of Au2S3 and nanocrystalline gold by sonochemical method

  M. Kristl, M. Drofenik
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  ABSTRACT: We report a new synthesis of Au2S3 by a sonochemical reaction between Au(CH3COO)3 and S in decalin at room temperature in nitrogen atmosphere. When gold acetate is sonicated under similar conditions without the presence of sulfur, nanocrystalline gold is formed. The products were characterized by X-ray powder diffraction, transmission electron microscope and thermal analysis (TG and DSC). The synthesis procedure is substantially simpler than the previously reported methods.
  Inorganic Chemistry Communications 6(12):1419-1422. · 1.97 Impact Factor