Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles

Alejandro G. Roca, Igor V. Golosovsky, Elin Winkler, Alberto López-Ortega, Marta Estrader, Roberto D. Zysler, María Dolors Baró, Josep Nogués

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 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.
Original languageEnglish
Article number1703963
JournalSmall
Volume14
Issue number15
DOIs
Publication statusPublished - 12 Apr 2018

Keywords

  • CoO wurtzite
  • CoO zinc blende
  • antiferromagnets
  • incommensurate structures
  • uncompensated spins

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