Electronic and magnetic properties of a ferromagnetic cobalt surface by adsorbing ultrathin films of tetracyanoethylene

Ultrathin films of tetracyanoethylene (TCNE) on Co(100) were investigated by means of spin-integrated and spin-resolved photoemission spectroscopy ((sp-)UPS), X-ray photoemission spectroscopy (XPS), near edge X-ray absorption fine-structure spectroscopy (NEXAFS), and X-ray magnetic circular dichrois...

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Veröffentlicht in:Physical chemistry chemical physics : PCCP 2019-07, Vol.21 (28), p.15833-15844
Hauptverfasser: Lach, Stefan, Altenhof, Anna, Shi, Shengwei, Fahlman, Mats, Ziegler, Christiane
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container_issue 28
container_start_page 15833
container_title Physical chemistry chemical physics : PCCP
container_volume 21
creator Lach, Stefan
Altenhof, Anna
Shi, Shengwei
Fahlman, Mats
Ziegler, Christiane
description Ultrathin films of tetracyanoethylene (TCNE) on Co(100) were investigated by means of spin-integrated and spin-resolved photoemission spectroscopy ((sp-)UPS), X-ray photoemission spectroscopy (XPS), near edge X-ray absorption fine-structure spectroscopy (NEXAFS), and X-ray magnetic circular dichroism (XMCD). We found a coverage-dependent modulation of the interface dipole and a switching between a metallic and a resistive spin filtering at the interface triggered by two distinct adsorption geometries of TCNE. The strongest hybridization and spin structure modifications are found at low coverage with a face-on adsorption geometry indicating changes in the distance between the surface Co atoms beneath. TCNE has the potential to manipulate the magnetic moments in the Co surface itself, including the possibility of magnetic hardening effects. In summary, the system TCNE/Co offers an experimentally rather easy and controllable way to build up a stable molecular platform stabilizing the reactive ferromagnetic Co surface and customizing the electronic and magnetic properties of the resulting spinterface simultaneously. This makes this system very attractive for spintronic applications as an alternative, less reactive but highly spin polarized foundation beside graphene-based systems. Understanding the very promising, highly spin polarized, foundation system TCNE/Co(100) for future spintronic architecture, using an advanced multi method approach.
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source Royal Society Of Chemistry Journals; Alma/SFX Local Collection
subjects Adsorption
Computer simulation
Dichroism
Dipoles
Ferromagnetic materials
Graphene
Magnetic moments
Magnetic properties
Magnetism
Photoelectric emission
Spectrum analysis
Spin structure
Surface chemistry
Thin films
X ray absorption
X ray photoelectron spectroscopy
title Electronic and magnetic properties of a ferromagnetic cobalt surface by adsorbing ultrathin films of tetracyanoethylene
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