Journal
NANOTECHNOLOGY
Volume 21, Issue 42, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/21/42/425702
Keywords
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Funding
- National Natural Science Foundation of China [50601021, 50701038, 60776014, 60876002, 50920105101, 10979002]
- Zhejiang University-Helmholtz cooperation fund
- Ministry of Education of China
- Department of Science and Technology of Zhejiang province, Zhejiang University
- Deutsche Forschungsgemeinschaft [SFB 569]
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Nickel oxide (NiO) nanoflowers, prepared by thermal decomposition, exhibit anomalous magnetic properties far below the blocking temperature, i.e., a cusp in both the zero-field-cooled and field-cooled curves at about 21 K. Detailed characterization discloses that the individual NiO nanoflower consists of porous crystals with holes (1.0-1.5 nm in size) inside. We believe that the low temperature magnetic feature observed here could be a new kind of spin transition for the uncompensated spins around the holes and will trigger more studies in other nanostructured antiferromagnetic materials.
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