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Merlin Pohlit (Department of Physics and Astronomy - Uppsala University)Poster (contributed)
The collective behaviour in ensembles of strongly interacting single-domain magnetic nanoparticles has been a matter of considerable interest over the past decades. Artificial Spin Ice (ASI) provides an experimental framework, where the geometry and interaction strength between mesospins, can be tailored at will. Furthermore, ASIs supporting thermal fluctuations are an ideal platform to study...
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Ms Nanny Strandqvist (Uppsala University)Poster (contributed)
The possibility to tailor geometries and lattices of nanosized magnetic elements allows one to design close to arbitrary types of magnetic metamaterials. Here we will address the magnetic properties of 2DXY mesospins, having hexagonal and square lattice arrangement. We will investigate the thermally induced order-disorder phase transitions for a range of interactions by altering the lattice...
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Mr Björn Erik Skovdal (Uppsala University)Poster (contributed)
In artificial square ice spin structures, the coupling strength between perpendicular mesospins is larger than between the collinear elements. Ideally one would like to be able to choose the asymmetry of the coupling strength, allowing the alteration of the obtained order and dynamics. In a previous study this was obtained by taking advantage of the change in interactions when shifting the...
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Mr Vojtěch Schánilec (1) CNRS, Inst NEEL, F-38000 Grenoble, France; 2) CEITEC Brno University of Technology, Brno, Czechia)Poster (contributed)
Arrays of interacting magnetic nanostructures were introduced as a powerful approach to investigate experimentally the exotic many-body physics of frustrated spin models. Following a similar strategy based on lithographically-patterned magnetic lattices, we provide a first attempt to fabricate a lab-on-chip platform to explore the physics of vertex models. The central idea of this work is to...
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Dr Nicholas Bingham (Department of Applied Physics, Yale University)Poster (contributed)
Avalanches are phenomena in which there is a cascade-like transition between two states and are present in many material systems, e.g. flux penetration into superconductors. Generally, avalanches are pinned at defects however, these defects are difficult to control and thus the study of the avalanche process is rather difficult. In this work, we utilize the customization properties of...
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Mr Vojtěch Schánilec (1) Institute Néel, Grenoble, France; 2) CEITEC Brno University of Technology, Brno, Czechia)Poster (contributed)
The kagome dipolar spin ice presents a rich phase diagram with intriguing magnetic properties. In particular, the so-called spin ice II phase is characterized by a very unusual behavior: magnetic order and magnetic disorder coexist at thermodynamic equilibrium. This coexistence of order and disorder can be visualized in real space: although a magnetic configuration belonging to the spin ice II...
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Ms Agne Ciuciulkaite (Uppsala University)Poster (contributed)
Arrays of closely packed mesoscopic magnets provide a rich playground for investigations of collective magnetization dynamics. Here we report on the magnetization dynamics of a square array of circular iron palladium alloy nanodiscs. The dynamical properties are explored using ferromagnetic resonance measurements and micromagnetic simulations. The obtained spectra exhibit features resulting...
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Ms Xiaoyu Zhang (Yale University)Poster (contributed)
Vertex-Frustrated artificial spin ice systems are two-dimensional arrays of interacting ferromagnetic elements in which the moments are arranged in certain way that not all vertices can be relaxed into their lowest energy configuration simultaneously. As a consequence, these systems have degenerate ground states that include excited vertices and degeneracy comes from the allocation of excited...
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Mr Amade Bortis (ETH Zurich), Mr Jannis Lehmann (ETH Zurich)Poster (contributed)
The configuration of domains in ferromagnetic materials is determined by the interplay of competing energy terms. In ordered systems with zero net magnetisation, however, it is much less understood how microscopic coupling mechanisms affect the size and morphology of domains and domain walls. In order to access all relevant magnetic degrees of freedom, we investigate the formation of domains...
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Rair Macedo (University of Glasgow)Poster (contributed)
Artificial Spin Ices are arrays of strongly correlated nano-scale magnetic islands. While initially envisaged as a twodimensional analogue of bulk frustrated pyrochlores [1], they are now seen as a possible avenue for designing functional materials. Recently, a new tiling pattern of artificial spin ice has gained attention for its unusual ordering processes [2]. This patterning, called the...
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Dr Ioan-Augustin Chioar (Uppsala University, Sweden)Poster (contributed)
Artificial spin systems have facilitated the experimental exploration of classical frustrated spin models, with a particular attention given to the square ice geometry. However, due to the magnetostatic nature of inter-island couplings, most artificial realizations of square spin ice do not fulfill the energetic requirements specific to the celebrated square ice model. Several approaches have...
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Ms Elysia Sharma (Imperial College London)Poster (contributed)
Artificial spin ice (ASI) systems are 2D analogues of pyrochlore spin ice, which exhibit frustrated magnetism and magnetic monopole-like defects [1]. ASI is commonly studied in honeycomb or square lattices, but other geometries which exhibit frustration are of growing interest. Previous magnetotransport studies have observed an asymmetric Hall signal and postulated this is related to the phase...
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Mr Alexander Vanstone (Imperial College London)Poster (contributed)
Artificial spin ice (ASI) exhibits an effect referred to as return point memory (RPM) [1, 2] where the system cycles through exactly the same microstates upon subsequence field loops. The pathway the system takes as a result of the field protocol is strongly constrained by the quenched disorder of the system and the initial microstate the system starts in. While previous studies have focused...
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Ms Natascha Hedrich (University of Basel)Poster (contributed)
Quantum sensing and nanoscale magnetometry using the Nitrogen-Vacancy (NV) center in diamond has opened up a wide range of sensing possibilities. The NV center is an atomic-scale defect containing a single electron spin. A single NV center integrated into the tip of an all-diamond atomic force scanning probe enables high resolution, quantitative imaging of stray magnetic fields over a wide...
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Dr Jack C. Gartside (Imperial College London)Poster (contributed)
Much of the intrigue and utility of nanomagnetic systems arises from the properties of specific system-wide magnetic configurations, or microstates.
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From practical applications such as data storage to microstates of fundamental interest such as ground states or metastable particle-like excitations, the ability to prepare systems in any given microstate is of crucial importance.... -
Dr Vinayak Bhat (The École polytechnique fédérale de Lausanne (EPFL))Poster (contributed)
Since the discovery of quasicrystals, the effect of aperiodicity on fundamental physical phenomena has been pursued with great interest [1,2]. Using material-by-design approach and X-ray photoemission electron microscopy imaging, we studied magnetization reversal in aperiodic Penrose P3, P2, and Ammann quasicrystal lattices. The planar artificial quasicrystals consisted of ferromagnetic...
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Naemi Riccarda LeoPoster (contributed)
Based on recent proposals, small arrays containing a handful of magnetostatically-coupled single-domain nanomagnets, encoding binary information in their two stable magnetic configurations, could be employed for low-power information processing. Whereas thermally-activated moment reversal, which is at the heart of the computation cycle, complicates the design of reliable Boolean gates, it does...
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Dr Valerio Scagnoli (Paul Scherrer Institut)Poster (contributed)
In recent years, artificial spin systems, consisting of elongated single-domain ferromagnetic nanomagnets placed on the nodes of two-dimensional lattices and coupled via their dipolar magnetic fields, have been used to address open questions in frustrated magnetism. However, the imaging techniques so far used, are severely constrained in time and spatial resolution. We have therefore recently...
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Kevin HofhuisPoster (contributed)
Geometrical frustration arises when not all interactions are simultaneously satisfied, and artificial spin systems offer an ideal platform to study this with the use of microscopy techniques [1, 2]. Using spatially resolved x-ray photoemission electron microscopy (X-PEEM), we compare the thermal relaxation in artificial square spin ice fabricated out of Permalloy films, which were grown on a...
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Mr Vojtěch Schánilec (1) Institute Néel, Grenoble, France; 2) CEITEC Brno University of Technology, Brno, Czechia)Poster (contributed)
Assemblies of interacting ferromagnetic nanostructures allow real space imaging of the exotic properties often associated with frustrated magnetism. This capability to explore the rich many-body physics of frustrated spin systems through magnetic imaging triggered a wealth of studies at the frontier between nanomagnetism, condensed matter and statistical physics.
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Imaging partial or complex... -
Erik Folven (Department of Electronic Systems, Norwegian University of Science and Technology, Norway)Poster (contributed)
With a rapidly increasing rate of global data production, high-performance and low-power computing is an inevitable necessity. The SOCRATES project investigates Self-Organizing Computational substRATES in the form of artificial spin ice and biological neural networks. The goal is to develop an understanding of the computational properties of the substrates, making way for a radical shift in...
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Dr Susmita Saha (ETH Zurich and Paul Scherrer Institute)Poster (contributed)
Artificial spin ice (ASI) is a particular class of magnetic metamaterials where geometrical arrangement of single domain nano magnets well-defined lattices leads to degeneracy of low energy states and frustration. It has recently been shown that artificial spin ices can be considered as potential candidates for reprogrammable magnonic crystals [1-3]. Therefore, we have endeavored an extensive...
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Dominik SchildknechtPoster (contributed)
Recent experiments on artificial spin systems with continuous degrees of freedom [1,2] have renewed the interest of classical dipoles on regular lattices. The pioneering work of Luttinger-Tisza [3] paved the way to construct the ground state of such systems. Remarkably, in many different two- or three-dimensional geometries, dipolar spin systems show a continuous ground state degeneracy [4]....
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Mr Gavin Macauley (University of Glasgow)Poster (contributed)
Artificial Spin Ices (ASIs) are arrays of strongly correlated nano-scale magnetic islands. They function as an excellent physics playground in which to study the role of topology on critical phenomena. In this work, we investigate a variation on the canonical square ice system: namely, each island in an array is rotated about its centre through some angle. This rotation angle then defines a...
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Hubertus Luetkens (Paul Scherrer Institut)Poster (contributed)
Materials with interacting magnetic degrees of freedom display a rich variety of magnetic behaviour that can lead to novel collective equilibrium and out-of-equilibrium phenomena. In equilibrium, thermodynamic phases appear with the associated phase transitions providing a characteristic signature of the underlying collective behaviour.
Here we create a thermally active artificial kagome...
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