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Pàgina inicial > Articles > Articles publicats > Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles |
Data: | 2018 |
Resum: | 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 Néel temperature of T (zinc-blende) ≈225 K. Wurtzite-CoO also presents an antiferromagnetic order, T (wurtzite) ≈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. |
Ajuts: | Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 Ministerio de Economía y Competitividad IJCI-2014-21530 Ministerio de Economía y Competitividad SEV-2013-0295 |
Nota: | Altres ajuts: Beatriu de Pinos Fellowship (ref 2011 BP_B 00209) |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | Antiferromagnets ; CoO wurtzite ; CoO zinc blende ; Incommensurate structures ; Uncompensated spins |
Publicat a: | Small, Vol. 14, Issue 15 (April 2018) , art. 1703963, ISSN 1613-6829 |
Preprint 33 p, 4.8 MB |