Exchange bias in bulk layered hydroxylammonium fluorocobaltate(NH.sub.3./sub.OH).sub.2./sub.CoF.sub.4./sub..

0377142 - FZÚ 2013 RIV GB eng J - Journal Article
Jagličić, Z. - Zentková, M. - Mihalik, M. - Arnold, Zdeněk - Drofenik, M. - Krist, M. - Dojer, B. - Kasunič, M. - Golobič, A. - Jagodič, M.
Exchange bias in bulk layered hydroxylammonium fluorocobaltate(NH₃OH)₂CoF₄.
Journal of Physics-Condensed Matter. Roč. 24, č. 5 (2012), "056002-1"-"056002-7". ISSN 0953-8984. E-ISSN 1361-648X
Institutional research plan: CEZ:AV0Z10100521
Keywords : magnetic properties * magnetic phase transitions * (NH₃OH)₂CoF₄ * exchange bias * pressure effect
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.355, year: 2012

The magnetic properties of layered hydroxylammonium fluorocobaltate (NH3OH)2CoF4 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 TC=46.5 K and an antiferromagnetic transition at TN=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.
Permanent Link: http://hdl.handle.net/11104/0209385