Journal
SMALL
Volume 14, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703963
Keywords
antiferromagnets; CoO wurtzite; CoO zinc blende; incommensurate structures; uncompensated spins
Categories
Funding
- Generalitat de Catalunya [2017-SGR-292]
- ANPCyT
- CONICET Argentine [PICT-2015-0883, PIP 112-20110100519]
- Beatriu de Pinos Fellowship [2011 BP_B 00209]
- Juan de la Cierva Program (MINECO) [IJCI-2014-21530]
- CERCA Programme/Generalitat de Catalunya
- Severo Ochoa Program (MINECO) [SEV-2013-0295]
- [RFBR 16-02-00058]
- [RG 14.B25.31.0025]
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Although cubic rock salt-CoO has been extensively studied, the magnetic properties of the main nanoscale CoO polymorphs (hexagonal wurtzite and cubic zinc blende structures) are rather poorly understood. Here, a detailed magnetic and neutron diffraction study on zinc blende and wurtzite CoO nanoparticles is presented. The zinc blende-CoO phase is antiferromagnetic with a 3rd type structure in a face-centered cubic lattice and a Neel temperature of T-N (zinc-blende) approximate to 225 K. Wurtzite-CoO also presents an antiferromagnetic order, T-N (wurtzite) approximate to 109 K, although much more complex, with a 2nd type order along the c-axis but an incommensurate order along the y-axis. Importantly, the overall magnetic properties are overwhelmed by the uncompensated spins, which confer the system a ferromagnetic-like behavior even at room temperature.
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