Electronic and magnetic properties of TTF and TCNQ covered Co thin films
| Autor: | Elmer van Geijn, Machiel Pieter de Jong, Kai Wang |
|---|---|
| Přispěvatelé: | Faculty of Engineering Technology |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
General Physics and Astronomy 02 engineering and technology IR-102945 01 natural sciences Spin magnetic moment Paramagnetism chemistry.chemical_compound Condensed Matter::Materials Science 0103 physical sciences Physical and Theoretical Chemistry 010306 general physics Condensed matter physics Coercivity 021001 nanoscience & nanotechnology Magnetic hysteresis equipment and supplies Tetracyanoquinodimethane Magnetic susceptibility Organic semiconductor chemistry Chemical physics Condensed Matter::Strongly Correlated Electrons 0210 nano-technology human activities Tetrathiafulvalene |
| Zdroj: | Journal of chemical physics, 144(17). American Institute of Physics |
| ISSN: | 0021-9606 |
| DOI: | 10.1063/1.4948413 |
| Popis: | Interfacial effects like orbital hybridization and charge transfer strongly influence the transfer of spins from ferromagnetic metals to organic semiconductors and can lead to the formation of interfacial states with distinct magnetic properties. The changes in the electronic and magnetic properties of a thin Co film upon adsorption of a layer of either the molecular organic electron donor tetrathiafulvalene (TTF) or the acceptor tetracyanoquinodimethane (TCNQ) have been investigated by X-ray absorption spectroscopy and X-ray magnetic circular dichroism using synchrotron radiation. Clear differences between the spectra of the adsorbed molecules and the neutral molecules show the hybridization of the molecular orbitals with the Co interface. Deposition of both organic materials leads to a small increase of the ratio of the orbital magnetic moment to the spin magnetic moment of the Co atoms at the interface. The main effect of overlayer deposition is a modification of the magnetic hysteresis of the Co film: The TCNQ slightly reduces the coercivity of the Co, while the TTF increases the coercivity by a factor of ∼1.5. These complementary effects of either a molecular organic electron donor or acceptor on the interfacial properties of a metal ferromagnetic thin film are a promising result for the controlled modification of the magnetic structure of hybrid interfaces. |
| Databáze: | OpenAIRE |
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