128 citations · 919 across the 50 of their papers we have counts for
16 papers · 1 filter
Mapping Reversal Pathways and Interaction Fields in Artificial Spin Ice
Brindaban Ojha, Matías P. Grassi, Vassilios Kapaklis
In artificial spin ice (ASI), magnetic interactions between nanomagnets determine both the stable states and the switching pathways under an applied field. Here, first-order revers…
Magnetic metamaterials by ion-implantation
Christina Vantaraki, Petter Ström, Tuan T. Tran +6
We present a method for the additive fabrication of planar magnetic nanoarrays with minimal surface roughness. Synthesis is accomplished by combining electron-beam lithography, use…
One-shot pair distribution functions of thin films using lab-based x-ray sources
Johan Bylin, Vassilios Kapaklis, Gunnar K. Pálsson
We demonstrate the feasibility of obtaining accurate pair distribution functions of thin amorphous films down to 80 nm, using modern laboratory-based x-ray sources. The pair distri…
Boundary-induced phase in epitaxial iron layers
Anna L. Ravensburg, Mirosław Werwiński, Justyna Rychły-Gruszecka +9
We report the discovery of a boundary-induced body-centered tetragonal (bct) iron phase in thin films deposited on MgAlO () substrates. We present evidence for thi…
The effect of iron layer thickness on the interlayer exchange coupling in Fe/MgO (001) superlattices
Anna L. Ravensburg, Matías P. Grassi, Björgvin Hjövarsson +1
We describe the effect of the Fe layer thickness on the antiferromagnetic interlayer exchange coupling in [Fe/MgO] superlattices. An increase in coupling strength with increasi…
Optically Induced Ferromagnetic Order in a Ferrimagnet
Sergii Parchenko, Agne Åberg Larsson, Vassilios Kapaklis +2
The parallel or antiparallel arrangement of electron spins plays a pivotal role in determining the properties of a physical system. To meet the demands for innovative technological…
GenL: An extensible fitting program for Laue oscillations and whole pattern fitting
Anna L. Ravensburg, Johan Bylin, Vassilios Kapaklis +1
GenL is a flexible program that can be used to simulate and/or fit X-ray reflectivity and X-ray diffraction data from epitaxial thin films exhibiting, for example, Laue oscillation…
Epitaxy enhancement in oxide/tungsten heterostructures by harnessing the interface adhesion
Anna L. Ravensburg, Rimantas Brucas, Denis Music +4
The conditions whereby epitaxy is achieved are commonly believed to be mostly governed by misfit strain. We report on a systematic investigation of growth and interface structure o…
Influence of misfit strain on the physical properties of Fe thin films
Anna L. Ravensburg, Gunnar K. Pálsson, Merlin Pohlit +2
We investigate the growth of thin Fe layers on MgAlO~(001) and MgO~(001) substrates using dc magnetron sputtering. The crystal quality of Fe layers deposited on MgAlO$_…
Impact of the crystal orientation on spin-orbit torques in Fe/Pd bilayers
Ankit Kumar, Nilamani Behera, Rahul Gupta +5
Spin-orbit torques in ferromagnetic (FM)/non-magnetic (NM) heterostructures offer more energy-efficient means to realize spin-logic devices; however, their strengths are determined…
The impact of nanoscale compositional variation on the properties of amorphous alloys
Ryota Gemma, Moritz to Baben, Astrid Pundt +2
The atomic distribution in amorphous FeZr alloys is found to be close to random, nevertheless, the composition can not be viewed as being homogenous at the nm-scale. The spatial va…
Magnetic order and energy-scale hierarchy in artificial spin ice
Henry Stopfel, Erik Östman, Ioan-Augustin Chioar +6
In order to explain and predict the properties of many physical systems, it is essential to understand the interplay of different energy-scales. Here we present investigations of t…
Influence of the magnetic field on the plasmonic properties of transparent Ni anti-dot arrays
Emil Melander, Erik Östman, Janine Keller +8
Extraordinary optical transmission is observed due to the excitation of surface plasmon polaritons (SPPs) in 2-Dimensional hexagonal anti-dot patterns of pure Ni thin films, grown…
Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot arrays
Evangelos Th. Papaioannou, Vassilios Kapaklis, Emil Melander +7
The influence of surface plasmons on the magneto-optic activity in a two-dimensional hexagonal array is addressed. The experiments were performed using hexagonal array of circular…
Nanolithographic templates using diblock copolymer films on chemically heterogeneous substrates
Vassilios Kapaklis, Spyridon Grammatikopoulos, Roman Sordan +6
The orientation of the lamellae formed by the phase separation of symmetric diblock copolymer thin films is strongly affected by the wetting properties of the polymer blocks with r…
Stability of an Exciton bound to an Ionized Donor in Quantum Dots
S. Baskoutas, W. Schommers, A. F. Terzis +3
Total energy, binding energy, recombination rate (of the electron hole pair) for an exciton (X) bound in a parabolic two dimensional quantum dot by a donor impurity located on the…