128 citations · 919 across the 50 of their papers we have counts for
50 papers
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…
Long-Range Magnetic Order in Structurally Embedded Mesospin Metamaterials
Christina Vantaraki, Oier Bikondoa, Matías P. Grassi +11
Engineered assemblies of interacting magnetic elements-magnetic metamaterials-provide a powerful route to tailor collective magnetic order and dynamics. By structuring matter at th…
Quantitative measurement of magnetic dichroic signals at sub-nanometer to atomic scale resolution conditions
Sharath Kumar Manjeshwar Sathyanath, Anna L. Ravensburg, Vassilios Kapaklis +3
When aiming for atomic resolution electron magnetic circular dichroism (EMCD) in STEM mode, the high convergence angle of the electron probe can lead to unforeseen artefacts and st…
Exponential Dependence of Interlayer Exchange Coupling in Fe/MgO(001) Superlattices on Temperature
Nanny Strandqvist, Tobias Warnatz, Kristbjörg Anna Thórarinsdóttir +3
The interlayer exchange coupling in Fe/MgO(001) superlattices is found to increase exponentially with decreasing temperature. Around 150~K, the field induced response changes from…
Magnetic texture control in ion-implanted metamaterials
Christina Vantaraki, Kristina Ignatova, Dmitrii Moldarev +5
We study experimentally the impact of the additive fabrication method on the magnetic properties of Fe-implanted Pd square artificial spin ice lattices. Our findings show that…
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…
Magnetic Order and Long-Range Interactions in Mesoscopic Ising Chains
Christina Vantaraki, Matías P. Grassi, Kristina Ignatova +4
We investigate the design of magnetic ordering in one-dimensional mesoscopic magnetic Ising chains by modulating long-range interactions. These interactions are affected by geometr…
Demagnetization dynamics after noncollinear dual optical excitation
Sergii Parchenko, Matthias Riepp, Simon Marotzke +4
We explore the impact of optical excitation using two interfering ultrashort optical pulses on ultrafast magnetization dynamics. Our investigation focuses on Pt/Co/Pt multilayers a…
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…
Modelling nanomagnet vertex dynamics through Coulomb charges
Samuel D. Slöetjes, Matías P. Grassi, Vassilios Kapaklis
We investigate the magnetization dynamics in nanomagnet vertices often found in artificial spin ices. Our analysis involves creating a simplified model that depicts edge magnetizat…
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…
Terahertz emission from -W/CoFe epitaxial spintronic emitters
Venkatesh Mottamchetty, Rimantas Brucas, Anna L. Ravensburg +8
We report efficient terahertz (THz) generation in epitaxial -W/CoFe spintronic emitters. Two types of emitters have been investigated; epitaxial -W/Co$_{…
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…
Plasmon-enhanced optical control of magnetism at the nanoscale via the inverse Faraday effect
Sergii Parchenko, Kevin Hofhuis, Agne Ciuciulkaite +4
The relationship between magnetization and light has been the subject of intensive research for the past century, focusing on the impact of magnetic moments on light polarization.…
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…
Polymerization in magnetic metamaterials
Samuel D. Slöetjes, Matías P. Grassi, Vassilios Kapaklis
We numerically study a mesoscopic system consisting of magnetic nanorings in the presence of thermal magnetization fluctuations. We find the formation of dipolar-field-mediated ``b…
Texture fluctuations and emergent dynamics in coupled nanomagnets
Samuel D. Slöetjes, Björgvin Hjörvarsson, Vassilios Kapaklis
We analyse the thermal fluctuations of magnetization textures in two stray field coupled elements, forming mesospins. To this end, the energy landscape associated with the thermal…
Emergent anisotropy in magnetic metamaterials
Nanny Strandqvist, Björn Erik Skovdal, Merlin Pohlit +3
We demonstrate directional dependence of the self-modification of internal mesospin textures in magnetic metamaterials, arising from the coupling of the atomic- and mesoscopic leng…
Thermal excitations within and among mesospins in artificial spin ice
Björn Erik Skovdal, Samuel D. Slöetjes, Merlin Pohlit +3
We provide experimental and numerical evidence for thermal excitations within and among magnetic mesospins, forming artificial spin ice structures. At low temperatures, a decrease…
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$_…
Self-assembly and percolation in magnetic colloids
Hauke Carstensen, Anne Krämer, Vassilios Kapaklis +1
We study the self-assembly of branching-chain networks and crystals in a binary colloidal system with tunable interactions. The particle positions are extracted from microscope ima…
Steering light with magnetic textures
Ioan-Augustin Chioar, Christina Vantaraki, Merlin Pohlit +4
We study the steering of visible light using a combination of magneto-optical effects and the reconfigurability of magnetic domains in Yttrium-Iron Garnet films. The spontaneously…