2026-04-13T13:21:36Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Roca, Alejandro G. author Golosovsky, Igor V. author Winkler, Elin author López-Ortega, Alberto author Estrader i Bofarull, Marta author Zysler, Roberto D. author Baró, M. D. author Nogués, Josep author 2021-03-29T15:18:53Z 2021-03-29T15:18:53Z 2018-02-26 2021-03-29T15:18:53Z 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. Ferromagnetisme Nanopartícules Zinc Ferromagnetism Nanoparticles Zinc Unravelling the elusive antiferromagnetic order in wurtzite and zinc blende CoO polymorph nanoparticles