Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles
Gómez Roca, Alejandro 
(Institut Català de Nanociència i Nanotecnologia)
Golosovsky, I. V. (Peterburgskiĭ institut i︠a︡dernoĭ fiziki im. B.P. Konstantinova)
Winkler, Elin (Centro Atómico Bariloche)
López Ortega, Alberto 
(CIC nanoGUNE)
Estrader, Marta 
(Institut Català de Nanociència i Nanotecnologia)
Zysler, Roberto D. (Centro Atómico Bariloche)
Baró, M. D.
(Universitat Autònoma de Barcelona. Departament de Física)
Nogués, Josep
(Institut Català de Nanociència i Nanotecnologia)
Date: |
2018 |
Abstract: |
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. |
Note: |
Altres ajuts: Beatriu de Pinos Fellowship (ref 2011 BP_B 00209) |
Note: |
Número d'acord de subvenció AGAUR/2017/SGR-292 |
Note: |
Número d'acord de subvenció MINECO/IJCI-2014-21530 |
Note: |
Número d'acord de subvenció MINECO/SEV-2013-0295 |
Rights: |
Tots els drets reservats.  |
Language: |
Anglès |
Document: |
article ; recerca ; submittedVersion |
Subject: |
Antiferromagnets ;
CoO wurtzite ;
CoO zinc blende ;
Incommensurate structures ;
Uncompensated spins |
Published in: |
Small, Vol. 14, Issue 15 (April 2018) , art. 1703963, ISSN 1613-6829 |
DOI: 10.1002/smll.201703963
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Record created 2019-10-21, last modified 2020-11-09