Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets

Michael Saccone; Andreas Scholl; Sven Velten; Scott Dhuey; Kevin Hofhuis; Clemens Wuth; Yen-Lin Huang; Zuhuang Chen; Rajesh Chopdekar; Alan Farhan

doi:10.1103/PhysRevB.99.224403

Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets

Michael Saccone^*, Andreas Scholl, Sven Velten, Scott Dhuey, Kevin Hofhuis, Clemens Wuth, Yen-Lin Huang, Zuhuang Chen, Rajesh Chopdekar, Alan Farhan

^*Corresponding author for this work

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Abstract

We explore the thermodynamics in two-dimensional arrays consisting of Ising-type nanomagnets lithographically arranged onto random sites and angular orientations. Introducing these basic spin-glass ingredients, we study the characteristic features of the low-energy states achieved, following thermal-annealing protocols. From direct visualization of real-time dynamics, we record relaxation timescales together with magnetic susceptibility variations over temperature, revealing trends towards short-range order as randomness is increased, but falling short of pure spin-glass behavior. Our work provides a route towards the realization of artificial Ising spin-glass systems.

Original language	English
Article number	224403
Number of pages	7
Journal	Physical Review B
Volume	99
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.99.224403
Publication status	Published - 3 Jun 2019
MoE publication type	A1 Journal article-refereed

Keywords

CRITICAL EXPONENTS
ICE
ENERGY

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AU - Velten, Sven

AU - Dhuey, Scott

AU - Hofhuis, Kevin

AU - Wuth, Clemens

AU - Huang, Yen-Lin

AU - Chen, Zuhuang

AU - Chopdekar, Rajesh

AU - Farhan, Alan

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N2 - We explore the thermodynamics in two-dimensional arrays consisting of Ising-type nanomagnets lithographically arranged onto random sites and angular orientations. Introducing these basic spin-glass ingredients, we study the characteristic features of the low-energy states achieved, following thermal-annealing protocols. From direct visualization of real-time dynamics, we record relaxation timescales together with magnetic susceptibility variations over temperature, revealing trends towards short-range order as randomness is increased, but falling short of pure spin-glass behavior. Our work provides a route towards the realization of artificial Ising spin-glass systems.

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KW - ENERGY

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Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets

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