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Dataset associated with "Vogel-Fulcher-Tammann Freezing of a Thermally Fluctuating Artificial Spin Ice Probed by X-ray Photon Correlation Spectroscopy"
Citation
Morley, Sophie A. and Venero, Diego A. and Porro, Jose M. and Riley, Susan T. and Stein, Aaron and Steadman, Paul and Stamps, Robert L. and Langridge, Sean and Marrows, Christopher H. (2017) Dataset associated with "Vogel-Fulcher-Tammann Freezing of a Thermally Fluctuating Artificial Spin Ice Probed by X-ray Photon Correlation Spectroscopy". University of Leeds. [Dataset] https://doi.org/10.5518/59
Dataset description
We report on the crossover from the thermal to athermal regime of an arti cial spin ice formed from a square array of magnetic islands whose lateral size, 30 nm 70 nm, is small enough that they are superparamagnetic at room temperature. We used resonant magnetic soft x-ray photon correlation spectroscopy (XPCS) as a method to observe the time-time correlations of the uctuating magnetic con gurations of spin ice during cooling, which are found to slow abruptly as a freezing temperature 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. Zero- eld-cooled/ eld-cooled magnetometry reveals a freeing up of uctuations 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 on freezing, which is unexpected for a system with a well-defined ground state.
| Subjects: | F000 - Physical sciences F000 - Physical sciences > F300 - Physics > F340 - Mathematical & theoretical physics > F341 - Electromagnetism |
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| Divisions: | Faculty of Engineering and Physical Sciences > School of Electronic and Electrical Engineering Faculty of Engineering and Physical Sciences > School of Physics and Astronomy |
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| License: | Creative Commons Attribution 4.0 International (CC BY 4.0) | ||||||
| Date deposited: | 02 Jun 2017 09:31 | ||||||
| URI: | https://archive.researchdata.leeds.ac.uk/id/eprint/151 | ||||||
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fig3_g2_relaxfit [483kB] |
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