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Thermal string excitations in artificial spin-ice square dipolar array.

D Thonig, S Reißaus, I Mertig

    Journal of Physics. Condensed Matter : an Institute of Physics Journal
    |June 11, 2014
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    Summary
    This summary is machine-generated.

    Artificial spin ice arrays with displaced rows show increased magnetic string excitations, particularly at low temperatures. This theoretical study provides time scales for observing these unique quasi-monopole excitations experimentally.

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    Area of Science:

    • Condensed matter physics
    • Magnetism
    • Computational physics

    Background:

    • Artificial spin ice systems are engineered magnetic materials with tunable properties.
    • Understanding thermal excitations is crucial for their potential applications.

    Purpose of the Study:

    • To theoretically investigate the impact of structural modifications on magnetic excitations in artificial spin ice.
    • To determine the thermal stability and experimental observability of these excitations.

    Main Methods:

    • Theoretical modeling of artificial spin-ice dipolar arrays.
    • Utilizing a nanoisland shape from experimental studies.
    • Employing kinetic Monte Carlo simulations.

    Main Results:

    • Vertical displacement of rows and columns significantly increases thermal magnetic string excitations.
    • Large increments in excitations observed at low temperatures.
    • String excitations with quasi-monopoles of charges ± 4 are particularly enhanced.

    Conclusions:

    • Structural modifications offer a route to control magnetic excitations in artificial spin ice.
    • The findings provide insights into the thermal stability and experimental observation of these excitations.
    • This work contributes to the fundamental understanding of emergent magnetic phenomena in artificial systems.