Zobrazeno 1 - 10
of 132
pro vyhledávání: '"Vassilios Kapaklis"'
Publikováno v:
Physical Review Research, Vol 5, Iss 3, p L032029 (2023)
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 “bonds” promoting the formation of annuli clusters, where the amount
Externí odkaz:
https://doaj.org/article/acc0dc7653da4c9385af6429666c0771
Publikováno v:
Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
Abstract 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 variation of the local composition is identified as the root of
Externí odkaz:
https://doaj.org/article/2e4ae6e302df45a6b5d9b95343f2ab25
Autor:
Richard M. Rowan-Robinson, Jérome Hurst, Agne Ciuciulkaite, Ioan-Augustin Chioar, Merlin Pohlit, Mario Zapata-Herrera, Paolo Vavassori, Alexandre Dmitriev, Peter M. Oppeneer, Vassilios Kapaklis
Publikováno v:
Advanced Photonics Research, Vol 2, Iss 10, Pp n/a-n/a (2021)
Nanometer‐thin rare‐earth–transition‐metal (RE–TM) alloys with precisely controlled compositions and out‐of‐plane magnetic anisotropy are currently in the focus for ultrafast magnetophotonic applications. However, achieving lateral nano
Externí odkaz:
https://doaj.org/article/f45fbf27377641fc9280dbdf27ddcde0
Autor:
Richard M. Rowan-Robinson, Emil Melander, Ioan-Augustin Chioar, Blanca Caballero, Antonio García-Martín, Evangelos Th. Papaioannou, Vassilios Kapaklis
Publikováno v:
AIP Advances, Vol 9, Iss 2, Pp 025317-025317-5 (2019)
Large surface plasmon polariton assisted enhancement of the magneto-optical activity has been observed in the past, through spectral measurements of the polar Kerr rotation in Co hexagonal antidot arrays. Here, we report a strong thickness dependence
Externí odkaz:
https://doaj.org/article/35b9cb2a5cee4358b3e3bed837fff4da
Autor:
Unnar B Arnalds, Jonathan Chico, Henry Stopfel, Vassilios Kapaklis, Oliver Bärenbold, Marc A Verschuuren, Ulrike Wolff, Volker Neu, Anders Bergman, Björgvin Hjörvarsson
Publikováno v:
New Journal of Physics, Vol 18, Iss 2, p 023008 (2016)
We present a direct experimental investigation of the thermal ordering in an artificial analogue of an asymmetric two-dimensional Ising system composed of a rectangular array of nano-fabricated magnetostatically interacting islands. During fabricatio
Externí odkaz:
https://doaj.org/article/209aee2e1e334f6086dd57f2e8214912
Autor:
Erik Östman, Unnar B Arnalds, Emil Melander, Vassilios Kapaklis, Gunnar K Pálsson, Alexander Y Saw, Marc A Verschuuren, Florian Kronast, Evangelos Th Papaioannou, Charles S Fadley, Björgvin Hjörvarsson
Publikováno v:
New Journal of Physics, Vol 16, Iss 5, p 053002 (2014)
We demonstrate a lossless switching between vortex and collinear magnetic states in circular FePd disks arranged in a square lattice. Above a bifurcation temperature $\left( {{T}_{\text{e}}} \right)$ we show that thermal fluctuations are enough to fa
Externí odkaz:
https://doaj.org/article/efbcbf12e4a744a3b766d0a3a369ee61
Autor:
Reda Moubah, Fridrik Magnus, Atieh Zamani, Vassilios Kapaklis, Per Nordblad, Björgvin Hjörvarsson
Publikováno v:
AIP Advances, Vol 3, Iss 2, Pp 022113-022113 (2013)
A clear change in the magnetic anisotropy in a layer of amorphous Co95Zr5 is obtained at the orthorhombic phase transition of the BaTiO3 substrate. The use of an amorphous buffer layer between the ferroelectric substrate and amorphous magnetic film s
Externí odkaz:
https://doaj.org/article/cdb09733a52b4fcb924f78a144118e17
Autor:
Björn Erik Skovdal, Samuel D. Slöetjes, Merlin Pohlit, Henry Stopfel, Vassilios Kapaklis, Björgvin Hjörvarsson
Publikováno v:
Physical Review B. 107
We provide experimental and numerical evidence for thermal excitations within and among magnetic mesospins, forming artificial spin ice structures. At low temperatures, a decrease in magnetization and increase in susceptibility is observed with incre
Publikováno v:
Soft Matter. 18:6222-6228
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 microscopy images and order parameters are extracted by image processing and statist
Autor:
Nanny Strandqvist, Björn Erik Skovdal, Merlin Pohlit, Henry Stopfel, Lisanne van Dijk, Vassilios Kapaklis, Björgvin Hjörvarsson
Publikováno v:
Physical Review Materials. 6
We demonstrate the presence of an emergent magnetic anisotropy in square lattices of circular mesospins. An external field is used to saturate the magnetization along the [10] and [11] directions before quantifying the magnetic textures at remanence.