Spin glass like transition and the exchange bias effect in Co3O4 nanoparticles anchored onto graphene sheets.
Phys Chem Chem Phys
; 21(1): 260-267, 2018 Dec 19.
Article
em En
| MEDLINE
| ID: mdl-30519700
ABSTRACT
We have synthesized Co3O4 nanoparticles having 40 nm average size, which are anchored on reduced graphene oxide. X-ray diffraction, FESEM, TEM and Raman spectroscopy are performed for the characterization. The temperature dependence of field cooled (FC) and zero field cooled (ZFC) magnetization curves exhibits antiferromagnetic (AFM) transition around â¼30 K, as observed for bulk Co3O4. The exchange bias effect is observed below â¼30 K. A significant change in the exchange bias effect is noted around â¼8 K, which is close to a spin-glass-like transition. The spin-glass-like phase has been confirmed by the memory effects observed by different experimental protocols. The possible origin of exchange bias is discussed in the manuscript.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article