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Magnetic arctic circle physics in an artificial square ice magnet
Ondříšková, Martina ; Lacour, Daniel (oponent) ; Rougemaille, Nicolas (vedoucí práce)
Under specific boundary conditions, the square ice model exhibits phase separation, with a disordered core and an ordered outer region, known as the ’arctic circle’ phenomenon. Inspired by recent experimental realizations using programmable lattices, we aim to observe and investigate these properties in a square lattice of interacting nanomagnets, achieving the domain wall boundary conditions (DWBC) necessary for the arctic circle and exploring their overall impact on the system. In this work, we will use magnetic force microscopy on lithographically fabricated arrays to directly observe the topological nature of the Coulomb phase and the monopole segregation mechanism. Employing an innovative approach, we will engineer the boundary conditions of the lattice through specific wiring of the nanomagnets at the edges. Our work will not only focus on the spin liquid nature of the disordered region within the arctic curve and monopole segregation by magnetic charge and moment but also on the propagation of constraints from the DWBC and their overall impact on the system.
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Magnetic phases in an artificial realization of the square ice model
Brunn, Ondřej ; Hrabec, Aleš (oponent) ; Rougemaille, Nicolas (vedoucí práce)
Artificial spin systems are convenient tool for exploring and manipulating unconventional exotic low-energy states directly in real space. Experimental realization of these system is made by pattering arrays of interacting nanomagnets with given geometry. First and also probably the most extensively studied artificial system have regular square lattice. In this work we deal with the modification of the square geometry that enable us to induce distinct magnetic phases of ice-type models. Results show that with appropriate tuning of the modification, several magnetic phases can be reached, including the disordered spin-liquid phase with trapped magnetic quasi-particles (magnetic monopoles).
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Magnetic phases in an artificial realization of the square ice model
Brunn, Ondřej ; Hrabec, Aleš (oponent) ; Rougemaille, Nicolas (vedoucí práce)
Artificial spin systems are convenient tool for exploring and manipulating unconventional exotic low-energy states directly in real space. Experimental realization of these system is made by pattering arrays of interacting nanomagnets with given geometry. First and also probably the most extensively studied artificial system have regular square lattice. In this work we deal with the modification of the square geometry that enable us to induce distinct magnetic phases of ice-type models. Results show that with appropriate tuning of the modification, several magnetic phases can be reached, including the disordered spin-liquid phase with trapped magnetic quasi-particles (magnetic monopoles).
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