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      Spin Solid versus Magnetic Charge Ordered State in Artificial Honeycomb Lattice of Connected Elements

      Advanced Science
      John Wiley and Sons Inc.
      artificial magnetic honeycomb lattices, geometrical frustration, neutron reflectometry measurements

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          Abstract

          Abstract The nature of magnetic correlation at low temperature in two‐dimensional artificial magnetic honeycomb lattice is a strongly debated issue. While theoretical researches suggest that the system will develop a novel zero entropy spin solid state as T → 0 K, a confirmation to this effect in artificial honeycomb lattice of connected elements is lacking. This study reports on the investigation of magnetic correlation in newly designed artificial permalloy honeycomb lattice of ultrasmall elements, with a typical length of ≈12 nm, using neutron scattering measurements and temperature‐dependent micromagnetic simulations. Numerical modeling of the polarized neutron reflectometry data elucidates the temperature‐dependent evolution of spin correlation in this system. As temperature reduces to ≈7 K, the system tends to develop novel spin solid state, manifested by the alternating distribution of magnetic vortex loops of opposite chiralities. Experimental results are complemented by temperature‐dependent micromagnetic simulations that confirm the dominance of spin solid state over local magnetic charge ordered state in the artificial honeycomb lattice with connected elements. These results enable a direct investigation of novel spin solid correlation in the connected honeycomb geometry of 2D artificial structure.

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          Classics in Magnetics A Phenomenological Theory of Damping in Ferromagnetic Materials

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            GenX: an extensible X-ray reflectivity refinement program utilizing differential evolution

            GenXis a versatile program using the differential evolution algorithm for fitting X-ray and neutron reflectivity data. It utilizes the Parratt recursion formula for simulating specular reflectivity. The program is easily extensible, allowing users to incorporate their own models into the program. This can be useful for fitting data from other scattering experiments, or for any other minimization problem which has a large number of input parameters and/or contains many local minima, where the differential evolution algorithm is suitable. In addition,GenXmanages to fit an arbitrary number of data sets simultaneously. The program is released under the GNU General Public License.
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              Real-space observation of emergent magnetic monopoles and associated Dirac strings in artificial kagome spin ice

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                Author and article information

                Journal
                5908362
                10.1002/advs.201700856
                1802.06322
                http://creativecommons.org/licenses/by/4.0/

                artificial magnetic honeycomb lattices,geometrical frustration,neutron reflectometry measurements

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