Exchange bias in bulk layered hydroxylammonium fluorocobaltate (NH3OH)2CoF4

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 reg...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2012-02, Vol.24 (5), p.056002-14
Main Authors: Jagli i, Z, Zentková, M, Mihalik, M, Arnold, Z, Drofenik, M, Kristl, M, Dojer, B, Kasuni, M, Golobi, A, Jagodi, M
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bias
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Exchange
Exchange and superexchange interactions
Heat capacity
Magnetic fields
Magnetic permeability
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Physics
Specific heat
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Summary: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. 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 (NH3OH)2CoF4 material.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/24/5/056002