Abstract
We prepare two kinds of Co3O4 antiferromagneticnanocrystallite systems with different surface structures: one grainsurface is covered by polymer decomposition residues (PDRs) (referred to asCS) and the other is naked (NS). It has been found that the magneticproperties of the CS sample deviate greatly from those of the NS sample.For example, the CS sample exhibits an open loop up to 8 T at 4.2 K,while the two branches of the hysteresis loop for the NS samplesuperpose together when the field is in excess of 3 T. The averagepermanent magnetic moments per Co3O4 cell for the CS sampleare about three times larger than that of the NS sample. The coercivity andloop shift for the CS sample are enhanced remarkably in comparison withthe NS sample, i.e., from 73.8 and 11.0 kA/m for the NS sample to 116.5 and25.5 kA/m for the CS sample, respectively. The anomalous magneticproperties and their enhancements for the CS sample are attributed tothe surface spin pinning effect by PDRs.
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