Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101879
Title: Non-Heisenberg covalent magnetism in iron oxide clusters
Authors: Logemann, R.
Rudenko, A. N.
Katsnelson, M. I.
Kirilyuk, A.
Issue Date: 2018
Publisher: American Physical Society
Citation: Non-Heisenberg covalent magnetism in iron oxide clusters / R. Logemann, A. N. Rudenko, M. I. Katsnelson, et al. — DOI 10.1103/PhysRevMaterials.2.073001 // Physical Review Materials. — 2018. — Vol. 2. — Iss. 7. — 073001.
Abstract: The sensitivity of material properties to the atomic and nanoscale morphology is most clearly demonstrated in small gas-phase clusters. In particular, magnetism serves as an extremely sensitive probe of the smallest modifications of atomic environment. This Rapid Communication demonstrates the drastic changes in both the exchange mechanism and the atomic moments in iron oxide clusters as compared to the bulk. In particular, the exchange is essentially non-Heisenberg and the exchange interactions are increased by an order of magnitude compared to bulk hematite. In addition, very large atomic magnetic moments are observed on oxygen sites due to strong spin polarization. As Fe3O4+ and Fe5O7+ are pure trivalent, double exchange is excluded and super exchange is the dominant exchange mechanism in these iron oxide clusters. Therefore, the non-Heisenberg behavior is attributed to covalent magnetism as the hybridization between Fe3d and O2p orbitals for clusters is strongly enhanced compared to bulk hematite and becomes magnetic state dependent. © 2018 American Physical Society.
Keywords: HEMATITE
MAGNETIC MOMENTS
MAGNETITE
SPIN POLARIZATION
ATOMIC ENVIRONMENT
ATOMIC MAGNETIC MOMENT
COVALENT MAGNETISM
EXCHANGE MECHANISM
GAS-PHASE CLUSTERS
IRON OXIDE CLUSTER
NANOSCALE MORPHOLOGY
RAPID COMMUNICATION
ATOMS
URI: http://hdl.handle.net/10995/101879
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85059584100
PURE ID: 7667362
ISSN: 24759953
DOI: 10.1103/PhysRevMaterials.2.073001
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

Files in This Item:
File Description SizeFormat 
2-s2.0-85059584100.pdf628,15 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.