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oai:recercat.cat:2445/1759062025-12-04T21:41:00Zcom_2072_1057col_2072_478917col_2072_478933

Unravelling the elusive antiferromagnetic order in wurtzite and zinc blende CoO polymorph nanoparticles Roca, Alejandro G. Golosovsky, Igor V. Winkler, Elin López-Ortega, Alberto Estrader i Bofarull, Marta Zysler, Roberto D. Baró, M. D. Nogués, Josep Ferromagnetisme Nanopartícules Zinc Ferromagnetism Nanoparticles Zinc 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. 2021-03-29T15:18:53Z 2021-03-29T15:18:53Z 2018-02-26 2021-03-29T15:18:53Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 1613-6810 https://hdl.handle.net/2445/175906 684859 eng Versió postprint del document publicat a: https://doi.org/10.1002/smll.201703963 Small, 2018, vol. 14, num. 15, p. 1703963 https://doi.org/10.1002/smll.201703963 (c) Wiley-VCH, 2018 info:eu-repo/semantics/openAccess 12 p. application/pdf Wiley-VCH Articles publicats en revistes (Química Inorgànica i Orgànica)