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@PHDTHESIS{Friedrich:826746,
author = {Friedrich, Rico},
title = {{A}b initio investigation of hybrid molecular-metallic
interfaces as a tool to design surface magnetic properties
for molecular spintronics},
volume = {138},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2017-00964},
isbn = {978-3-95806-194-1},
series = {Schriften des Forschungszentrums Jülich. Reihe
Schlüsseltechnologien / Key Technologies},
pages = {277 S.},
year = {2016},
note = {RWTH Aachen, Diss., 2016},
abstract = {Molecular spintronics aims to store and transmit
information encoded in the electron spin using single
molecular based magnetic units. In this thesis the magnetic
properties of hybrid molecular-metallic interfaces are
investigated by $\textit{ab initio}$ density functional
theory, the most successful electronic structure method over
the last decades. Most of the research in molecular
spintronics has been devoted to the magnetic properties of
the molecular part of the investigated systems. Here a
complementary approach is proposed in which hybrid
molecular-metallic interfaces are used as a tool to design
surface magnetic properties. Firstly, two effects: (i)
in-plane magnetic hardening, i. e. the increase of the
exchange coupling between the first layer magnetic surface
atoms below the molecule and (ii) inter-layer magnetic
softening, i. e. the reduction of the exchange coupling
between first and secondmagnetic surface layer locally below
the molecule, are investigated in detail: 1. The in-plane
magnetic hardening effect is tuned through a chemical
functionalization process by investigating a series of
$\pi$-bonded molecules adsorbed onto 1 monolayer Fe/W(110)
that give rise to specifically tailored magnetic hysteresis
curves. 2. The inter-layer magnetic softening effect is
generally connected to amolecular induced skyhookmechanism
as shown for dioxan and dioxin adsorbed onto 1 and 2
monolayers Fe/W(110): The first layer magnetic atoms
belowthe molecule are locally detached from the second layer
due to the repulsion of the peripheral hydrogen atoms of
themolecule from the surface and the attraction of the
central molecular part to the surface. 3. Spatially extended
two-dimensional $\pi$-electron systems as graphene and
hexagonal boron nitride lead to an in-plane magnetic
hardening on Co(111) but do not cause the inter-layer
softening revealing that the skyhook mechanism occurs only
for finite-size molecular adsorbates. 4. A molecule made up
of different rings as triphenyl-triazine can induce multiple
intramolecular magnetic units on 2 monolayers Fe/W(110)
within a single molecule-surface hybrid system offering
prospects for molecular based spin logic devices. In the
following it is demonstrated that the concept of molecular
induced manipulation of surface magnetic properties can be
generalized to surface Rashba systems: [...]},
cin = {PGI-1 / IAS-1 / JARA-FIT / JARA-HPC},
cid = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406 /
$I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
pnm = {142 - Controlling Spin-Based Phenomena (POF3-142) / 143 -
Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/826746},
}