Título:
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Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles
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Autor/a:
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Gómez Roca, Alejandro; Golosovsky, I. V.; Winkler, Elin; López-Ortega, Alberto; Estrader, Marta; Zysler, Roberto D.; Baró, M. D..; Nogués, Josep
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Abstract:
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Altres ajuts: Beatriu de Pinos Fellowship (ref 2011 BP_B 00209) |
Abstract:
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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 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. |
Materia(s):
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-Antiferromagnets -CoO wurtzite -CoO zinc blende -Incommensurate structures -Uncompensated spins |
Derechos:
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open access
Tots els drets reservats.
https://rightsstatements.org/vocab/InC/1.0/ |
Tipo de documento:
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Article |
Editor:
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Compartir:
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Uri:
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https://ddd.uab.cat/record/214196
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