Data associated with 'Effect of FePd alloy composition on the dynamics of artificial spin ice'

  1. Morley, SA 1
  2. Riley, ST 2
  3. Porro, Jose Maria 3
  4. Rosamond, Mark 2
  5. Linfield, Edmund 2
  6. Cunningham, John 2
  7. Langridge, Sean 3
  8. Marrows, CH 4
  1. 1 University of California, Santa Cruz
    info

    University of California, Santa Cruz

    Santa Cruz, Estados Unidos

    ROR https://ror.org/03s65by71

  2. 2 University of Leeds
    info

    University of Leeds

    Leeds, Reino Unido

    ROR https://ror.org/024mrxd33

  3. 3 Rutherford Appleton Laboratory
    info

    Rutherford Appleton Laboratory

    Didcot, Reino Unido

    ROR https://ror.org/03gq8fr08

  4. 4 Univresity of Leeds
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Editor: University Of Leeds

Año de publicación: 2018

Tipo: Dataset

DOI: 10.5518/298 lock_openAcceso abierto editor

Resumen

Artificial spin ices (ASI) are arrays of single domain nano-magnetic islands, arranged in geometries that give rise to frustrated magnetostatic interactions. It is possible to reach their ground state via thermal annealing. We have made square ASI using different FePd alloys to vary the magnetization via co-sputtering. From a polarized state the samples were incrementally heated and we measured the vertex population as a function of temperature using magnetic force microscopy. For the higher magnetization FePd sample, we report an onset of dynamics at $T = 493$ K, with a rapid collapse into $>90\%$ ground state vertices. In contrast, the low magnetization sample started to fluctuate at lower temperatures, $T = 393$ K and over a wider temperature range but only reached a maximum of $25\%$ of ground state vertices. These results indicate that the interaction strength, dynamic temperature range and pathways can be finely tuned using a simple co-sputtering process. In addition we have compared our experimental values of the blocking temperature to those predicted using the simple N\'{e}el-Brown two-state model and find a large discrepancy which we attribute to activation volumes much smaller than the island volume.