Observation of superficial antiferromagnetism in Co sub(3) O sub(4) polycrystals

We report on a systematic study about the magnetic properties of Co sub(3) O sub(4) polycrystals with large size distribution (100-1200 nm) and the crystallite size of 68(4) nm on average. An antiferromagnetic transition at T sub(N)= 32 K, extensively reported in the literature for Co sub(3) O sub(4...

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Bibliographic Details
Published in:Materials research express 2015-11, Vol.2 (11)
Main Authors: von Dreifus, Driele, Pereira, Ernesto Chaves, de Oliveira, Adilson Jesus Aparecido
Format: Article
Language:English
Subjects:
Air conditioning
Antiferromagnetism
Coercive force
Crystallites
Magnetic measurement
Magnetic permeability
Magnetic properties
Polycrystals
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Summary:We report on a systematic study about the magnetic properties of Co sub(3) O sub(4) polycrystals with large size distribution (100-1200 nm) and the crystallite size of 68(4) nm on average. An antiferromagnetic transition at T sub(N)= 32 K, extensively reported in the literature for Co sub(3) O sub(4), was observed. Furthermore, another transition at T sub(t)= 14 K, which is suppressed for H> or = 35 kOe, was also identified. An increase in the magnetic susceptibility, as well as irreversibility between zero field cooled and field cooled data below T sub(t) were observed. The non-detection of a coercive field below T sub(t), and the fact that T sub(t) and T sub(N) are independent from the driven frequencies in ac magnetic measurements as a function of temperature, confirm that both peaks are associated to antiferromagnetic transitions.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/2/11/116102