Institute of Fundamental Technological Research
Polish Academy of Sciences

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Petra Jenuš

Jožef Stefan Institute (SI)

Recent publications
1.  Guzik M.N., Golasiński K.M., Pedrosa F.J., Jenuš P., Bollero A., Hauback B.C., Deledda S., Influence of ultra-short cryomilling on the microstructural andmagnetic properties of cobalt ferrite, JOURNAL OF ALLOYS AND COMPOUNDS, ISSN: 0925-8388, DOI: 10.1016/j.jallcom.2017.05.290, Vol.721, pp.440-448, 2017

Abstract:
The impact of ultra-short milling at liquid nitrogen temperatures on structural and magnetic properties of cobalt ferrite (CoFe2O4) powders has been explored for the first time. Cryomilling for only up to 9 min increases the coercivity of the isotropic powder from 139 to 306 kA/m (1.74–3.85 kOe) and results in its modifications comparable with milling for hours at room temperature. A thermal treatment of processed CoFe2O4 enables further optimization of powder magnetic properties and leads to a high value of energy product (13.5 kJ/m3) for the sample treated at 600 °C. Systematic studies, comprising analysis of structural and microstructural properties, based on synchrotron powder X-ray diffraction, scanning and transmission electron microscopy demonstrate the high efficiency of cryomilling in reduction of crystallite sizes and formation of lattice strain in the processed cobalt ferrite samples.

Keywords:
Cryomilling, Cobalt ferrite, Magnetic properties

Affiliations:
Guzik M.N. - Institute for Energy Technology (NO)
Golasiński K.M. - other affiliation
Pedrosa F.J. - IMDEA Nanoscience (ES)
Jenuš P. - Jožef Stefan Institute (SI)
Bollero A. - IMDEA Nanoscience (ES)
Hauback B.C. - Institute for Energy Technology (NO)
Deledda S. - Institute for Energy Technology (NO)

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