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Diversity enabling equilibration: disorder and the ground state in artificial spin ice (Articolo in rivista)

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Diversity enabling equilibration: disorder and the ground state in artificial spin ice (Articolo in rivista) (literal)

Anno

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Alternative label

Zoe Budrikis (1,2); Paolo Politi (2,3); R. L. Stamps (1,4) (2011)
Diversity enabling equilibration: disorder and the ground state in artificial spin ice
in Physical review letters (Print); American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

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Note

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1) School of Physics, The University of Western Australia, 35 Stirling Hwy Crawley WA 6009 Australia 2) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy 3) INFN Sezione di Firenze, via G. Sansone 1, 50019 Sesto Fiorentino, Italy 4) SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom (literal)

Titolo

Diversity enabling equilibration: disorder and the ground state in artificial spin ice (literal)

Abstract

We report a novel approach to the question of whether and how the ground state can be achieved in square artificial spin ices where frustration is incomplete. We identify two sources of randomness that affect the approach to ground state: quenched disorder in the island response to fields and randomness in the sequence of driving fields. Numerical simulations show that quenched disorder can lead to final states with lower energy, and randomness in the sequence of driving fields always lowers the final energy attained by the system. We use a network picture to understand these two effects: disorder in island responses creates new dynamical pathways, and a random sequence of driving fields allows more pathways to be followed. (literal)

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