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Title: Vogel-Fulcher-Tammann freezing of a thermally fluctuating artificial spin ice probed by x-ray photon correlation spectroscopy

Journal Article · · Physical Review B
 [1];  [2];  [2];  [1];  [3];  [4];  [5];  [2];  [1]
  1. Univ. of Leeds (United Kingdom)
  2. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  5. Univ. of Glasgow, Scotland (United Kingdom)

We report on the crossover from the thermal to the athermal regime of an artificial spin ice formed from a square array of magnetic islands whose lateral size, 30 nm × 70 nm, is small enough that they are dynamic at room temperature.We used resonant magnetic soft x-ray photon correlation spectroscopy as a method to observe the time-time correlations of the fluctuating magnetic configurations of spin ice during cooling, which are found to slow abruptly as a freezing temperature of T0 = 178 ± 5 K is approached. This slowing is well described by a Vogel-Fulcher-Tammann law, implying that the frozen state is glassy, with the freezing temperature being commensurate with the strength of magnetostatic interaction energies in the array. The activation temperature, TA = 40 ± 10 K, is much less than that expected from a Stoner-Wohlfarth coherent rotation model. Zerofield- cooled/field-cooled magnetometry reveals a freeing up of fluctuations of states within islands above this temperature, caused by variation in the local anisotropy axes at the oxidised edges. This Vogel-Fulcher-Tammann behavior implies that the system enters a glassy state upon freezing, which is unexpected for a system with a well-defined ground state.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; AC02-98CH10886
OSTI ID:
1389248
Alternate ID(s):
OSTI ID: 1347265
Report Number(s):
BNL-114268-2017-JA; PRBMDO; KC0403020; TRN: US1702699
Journal Information:
Physical Review B, Vol. 95, Issue 10; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Dataset associated with 'Vogel-Fulcher-Tammann Freezing of a Thermally Fluctuating Arti cial Spin Ice Probed by X-ray Photon Correlation Spectroscopy'
  • Morley, S.A.; Alba-Venero, D.; Porro, J. M.
  • Research Data Leeds Repository-Supplementary information for journal article at DOI: 10.1103/PhysRevB.95.104422, 11 files https://doi.org/10.5518/59
dataset June 2017
Exact Solution of the Problem of the Entropy of Two-Dimensional Ice book January 2004
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Analysis of Recent Measurements of the Viscosity of Glasses journal May 1992
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Magnetic Monopoles in Spin Ice journal January 2008
Susceptibility phenomena in a fine particle system journal August 1992
Magnetic diffuse scattering in artificial kagome spin ice text January 2016
Melting artificial spin ice text January 2011
Direct entropy determination and application to artificial spin ice text January 2012
Colloquium: Artificial spin ice: Designing and imaging magnetic frustration text January 2013
Scenario for delocalization in translation invariant systems text January 2014
Kinetic pathways to the magnetic charge crystal in artificial dipolar spin ice text January 2014
Thermally induced magnetic relaxation in square artificial spin ice text January 2016
Artificial square ice and related dipolar nanoarrays text January 2006
Disorder-induced magnetic memory: Experiments and theories text January 2006

Cited By (8)

Frustration and thermalization in an artificial magnetic quasicrystal journal December 2017
Classical topological order in the kinetics of artificial spin ice journal April 2018
Effect of FePd alloy composition on the dynamics of artificial spin ice journal March 2018
Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice journal November 2019
Magnetization dynamics of weakly interacting sub-100 nm square artificial spin ices journal December 2019
Advances in artificial spin ice journal November 2019
Cooperative magnetic phenomena in artificial spin systems: spin liquids, Coulomb phase and fragmentation of magnetism – a colloquium journal March 2019
Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice text January 2018

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