Disorder Strength and Field-Driven Ground State Domain Formation in Artificial Spin Ice: Experiment, Simulation, and Theory

被引：82

作者：

Budrikis, Zoe ^{[1
,2
,3
]}

Morgan, J. P. ^{[4
]}

Akerman, J. ^{[4
,5
]}

Stein, A. ^{[6
]}

Politi, Paolo ^{[2
,7
]}

Langridge, S. ^{[8
]}

Marrows, C. H. ^{[4
]}

Stamps, R. L. ^{[3
]}

机构：

[1] Univ Western Australia, Sch Phys, Crawley, WA 6009, Australia

[2] CNR, Ist Sistemi Complessi, I-50019 Sesto Fiorentino, Italy

[3] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[4] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[5] Univ Politecn Madrid, ISOM, E-28040 Madrid, Spain

[6] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[7] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Sesto Fiorentino, Italy

[8] Rutherford Appleton Lab, ISIS, Chilton OX11 0QX, England

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 03期

基金：

澳大利亚研究理事会; 英国工程与自然科学研究理事会;

关键词：

Ising model;

D O I：

10.1103/PhysRevLett.109.037203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quenched disorder affects how nonequilibrium systems respond to driving. In the context of artificial spin ice, an athermal system comprised of geometrically frustrated classical Ising spins with a twofold degenerate ground state, we give experimental and numerical evidence of how such disorder washes out edge effects and provide an estimate of disorder strength in the experimental system. We prove analytically that a sequence of applied fields with fixed amplitude is unable to drive the system to its ground state from a saturated state. These results should be relevant for other systems where disorder does not change the nature of the ground state.

引用

页数：5

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