Emergent magnetic monopole and dipole screening by free electrons in aluminum/artificial spin ice heterostructures

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dc.creatorFernando F. Martins
dc.creatorTeônis Silva de Paiva
dc.creatorDaniel Gouveia Duarte
dc.creatorJoão Henrique Rodrigues
dc.creatorLucas Alvares da Silva Mól
dc.creatorClodoaldo Irineu Levartoski de Araujo
dc.date.accessioned2024-12-05T15:27:55Z
dc.date.accessioned2025-09-09T00:30:17Z
dc.date.available2024-12-05T15:27:55Z
dc.date.issued2022
dc.identifier.doihttps://doi.org/10.1063/5.0079897
dc.identifier.issn1077-3118
dc.identifier.urihttps://hdl.handle.net/1843/78475
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Restrito
dc.subjectTransição de fase
dc.subjectHeteroestrutura
dc.subjectEletrostática
dc.subjectLigas
dc.subjectMicroscopia de força magnética
dc.subjectHisterese
dc.subjectMicroscopia eletrônica de varredura
dc.subject.otherMagnetic ordering
dc.subject.otherPhase transitions
dc.subject.otherHeterostructures
dc.subject.otherElectrostatics
dc.subject.otherNanomagnets
dc.subject.otherAlloys
dc.subject.otherMagnetic force microscopy
dc.subject.otherMagnetic hysteresis
dc.subject.otherScanning electron microscopy
dc.titleEmergent magnetic monopole and dipole screening by free electrons in aluminum/artificial spin ice heterostructures
dc.typeArtigo de periódico
local.citation.issue6
local.citation.volume120
local.description.resumoIn this work, we present screening of magnetic monopole and dipole by the presence of a 20 nm aluminum cover layer on square artificial spin ice systems. Our measurements were performed by magnetic force microscopy on samples with and without aluminum at remanence, after application of successive external magnetic field steps. Experimental results show that both evolution of magnetization and monopole population under external field are affected by the aluminum presence. Very good agreement between those results and excitation model simulations was found when both emergent magnetic monopole and dipole strengths decrease on the presence of the aluminum cap. We suggest that the observed strength weakening of emergent particles occurs due to its field screening by aluminum-free electrons. The screening on the presented heterostructure could be used for devices design with different magnetic monopole mobility or for selective thermodynamic activation in samples close to superparamagnetic regime.
local.identifier.orcidhttps://orcid.org/0000-0002-7256-4820
local.identifier.orcidhttps://orcid.org/0000-0002-2417-7199
local.identifier.orcidhttps://orcid.org/0000-0002-5634-5206
local.identifier.orcidhttps://orcid.org/0000-0002-5001-0499
local.identifier.orcidhttps://orcid.org/0000-0003-2801-1759
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.aip.org/aip/apl/article-abstract/120/6/062405/2833123/Emergent-magnetic-monopole-and-dipole-screening-by?redirectedFrom=fulltext

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