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Unravelling the elusive antiferromagnetic order in wurtzite and zinc blende CoO polymorph nanoparticles

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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 TN (zinc‐blende) ≈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.

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ROCA, Alejandro g., GOLOSOVSKY, Igor v., WINKLER, Elin, LÓPEZ-ORTEGA, Alberto, ESTRADER I BOFARULL, Marta, ZYSLER, Roberto d., BARÓ, M. d., NOGUÉS, Josep. Unravelling the elusive antiferromagnetic order in wurtzite and zinc blende CoO polymorph nanoparticles. _Small_. 2018. Vol. 14, núm. 15, pàgs. 1703963. [consulta: 26 de febrer de 2026]. ISSN: 1613-6810. [Disponible a: https://hdl.handle.net/2445/175906]

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