INVESTIGADORES
ZYSLER Roberto Daniel
artículos
Título:
Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles
Autor/es:
ROCA, ALEJANDRO G.; GOLOSOVSKY, IGOR V.; WINKLER, ELIN; LÓPEZ-ORTEGA, ALBERTO; ESTRADER, MARTA; ZYSLER, ROBERTO D.; BARÓ, MARÍA DOLORS; NOGUÉS, JOSEP
Revista:
SMALL
Editorial:
WILEY-V C H VERLAG GMBH
Referencias:
Lugar: Weinheim; Año: 2018 vol. 2018 p. 1703963 - 1703963
ISSN:
1613-6810
Resumen:
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 TN (zincblende) ≈225 K. Wurtzite-CoO also presents an antiferromagnetic order, TN (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.
