Experimental Realization of the 1D Random Field Ising Model

N S Bingham; S Rooke; J Park; A Simon; W Zhu; X Zhang; J Batley; J D Watts; C Leighton; K A Dahmen; P Schiffer

doi:10.1103/PhysRevLett.127.207203

Experimental Realization of the 1D Random Field Ising Model

Phys Rev Lett. 2021 Nov 12;127(20):207203. doi: 10.1103/PhysRevLett.127.207203.

Authors

N S Bingham¹, S Rooke², J Park², A Simon¹, W Zhu¹, X Zhang^{1

2}, J Batley³, J D Watts^{3

4}, C Leighton³, K A Dahmen², P Schiffer^{1

2

5}

Affiliations

¹ Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA.
² Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
³ Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
⁴ School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
⁵ Department of Physics, Yale University, New Haven, Connecticut 06511, USA.

PMID: 34860045
DOI: 10.1103/PhysRevLett.127.207203

Abstract

We have measured magnetic-field-induced avalanches in a square artificial spin ice array of interacting nanomagnets. Starting from the ground state ordered configuration, we imaged the individual nanomagnet moments after each successive application of an incrementally increasing field. The statistics of the evolution of the moment configuration show good agreement with the canonical one-dimensional random field Ising model. We extract information about the microscopic structure of the arrays from our macroscopic measurements of their collective behavior, demonstrating a process that could be applied to other systems exhibiting avalanches.