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DOE OSTI · 3017613

Stretched exponential magnetic relaxation dynamics in artificial square ice revealed through x-ray photon correlation spectroscopy

Scagnoli, Valerio [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000281168870)·Skjærvø, Sandra H. [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000215322008)·Massey, Jamie R. [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)]·Sendetskyi, Oles [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000211412911)·Leo, Naëmi [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland); Loughborough Univ. (United Kingdom)] (ORCID:0000000208286889)·Mazzoli, Claudio [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000197741507)·Heyderman, Laura J. [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000338436611)·Derlet, Peter M. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000246906321)
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Abstract

X-ray photon correlation scattering measurements are undertaken on a thermally active artificial spin ice based on the square lattice, referred to as artificial square ice, to probe the fluctuation timescales as a function of temperature as the system passes through the paramagnetic-antiferromagnetic phase transition, which belongs to the two-dimensional Ising universality class. In the paramagnetic regime, a single exponential timescale is seen, whereas at and below the critical temperature, a stretched exponential decorrelation is observed, with the stretching exponent decreasing from unity down to below one-half as the temperature reduces. This trend is confirmed by kinetic Monte Carlo simulations of a simplified point-dipolar square ice system, and is in agreement with past theoretical work on the kinetic Ising model where stretched exponential relaxation due to equilibrium domain wall dynamics below the critical temperature was found.

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36 MATERIALS SCIENCEArtificial spin iceCoherent X-ray scatteringMagnetismMonte Carlo methodsPhase transitionsX-ray photon correlation spectroscopy

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Scagnoli, Valerio [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000281168870), Skjærvø, Sandra H. [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000215322008), Massey, Jamie R. [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)], Sendetskyi, Oles [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000211412911), Leo, Naëmi [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland); Loughborough Univ. (United Kingdom)] (ORCID:0000000208286889), Mazzoli, Claudio [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000197741507), Heyderman, Laura J. [Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000338436611), Derlet, Peter M. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000246906321). 2025-11-04. Stretched exponential magnetic relaxation dynamics in artificial square ice revealed through x-ray photon correlation spectroscopy. https://doi.org/10.1103/jyf8-4g92

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