Magnetic performances and switching behavior of Co-rich CoPtP micro-magnets for applications in magnetic MEMS

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dc.contributor.authorMallick, Dhiman
dc.contributor.authorPaul, Kankana
dc.contributor.authorMaity, Tuhin
dc.contributor.authorRoy, Saibal
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEuropean Regional Development Funden
dc.contributor.funderHorizon 2020en
dc.contributor.funderIrish Research Councilen
dc.date.accessioned2019-04-11T15:51:01Z
dc.date.available2019-04-11T15:51:01Z
dc.date.issued2019-01-08
dc.date.updated2019-04-11T14:49:31Z
dc.description.abstractIn this paper, the magnetic properties of Co-rich CoPtP films electrodeposited using an optimized Pulse Reverse (PR) technique are investigated for magnetic MEMS applications. By using a combination of forward and reverse pulses with optimized duty cycles during deposition and suitable bath chemistry, the film stress is reduced significantly, which results in smooth, crack-free films of thickness up to 26 μm. The deposited film of thickness ∼3 μm shows a coercivity of 268 kA/m, a remanence of 0.4 T, and a maximum energy product of 35 kJ/m3 in the out-of-plane direction. The variation in the hard-magnetic properties of the films for changing the film thickness is analyzed in terms of the composition, crystalline structure, and grain size. As the thickness is increased from 0.9 μm to 26 μm, the in-plane coercivity reduces by 17% due to an increase of the grain size and the Co content in the alloy structure. The in-plane squareness factor increases by 1.5 times as the thickness is increased over the above-mentioned range, which results in an enhancement of the in-plane remanence value. The magnetization reversal behavior of the deposited films indicates that the nature of magnetic interaction is significantly influenced by the thickness of the films, where the dipolar interaction for the thinner films changes to exchange coupling at higher thickness due to the increase of the grain size. Finally, an innovative design strategy to integrate CoPtP in magnetic MEMS devices by micro-patterning is proposed and analyzed using the finite element method. The demagnetization fields of the magnetic elements are minimized through optimized micro-patterned structures which improve the viability of PR deposited CoPtP micro-magnets having suitable nano-grains in potential MEMS based applications.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid23902en
dc.identifier.citationMallick, D., Paul, K., Maity, T. and Roy, S. (2019) 'Magnetic performances and switching behavior of Co-rich CoPtP micro-magnets for applications in magnetic MEMS', Journal of Applied Physics, 125(2), 023902 (14 pp). doi: 10.1063/1.5063860en
dc.identifier.doi10.1063/1.5063860en
dc.identifier.eissn1089-7550
dc.identifier.endpage14en
dc.identifier.issn0021-8979
dc.identifier.issued2en
dc.identifier.journaltitleJournal of Applied Physicsen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/7756
dc.identifier.volume125en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/13/RC/2077/IE/CONNECT: The Centre for Future Networks & Communications/en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::RIA/730957/EU/European Infrastructure Powering the Internet of Things/EnABLESen
dc.relation.urihttps://aip.scitation.org/doi/abs/10.1063/1.5063860
dc.rights© 2019 the authors. Published under license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Journal of Applied Physics and may be found at https://doi.org/10.1063/1.5063860en
dc.subjectCobalt alloysen
dc.subjectCoercive forceen
dc.subjectCrystal structureen
dc.subjectDemagnetisationen
dc.subjectElectrodepositionen
dc.subjectExchange interactions (electron)en
dc.subjectFinite element analysisen
dc.subjectGrain sizeen
dc.subjectInternal stressesen
dc.subjectMagnetic switchingen
dc.subjectMagnetic thin filmsen
dc.subjectMagnetisation reversalen
dc.subjectPhosphorus alloysen
dc.subjectPlatinen
dc.subjectThin filesen
dc.subjectMagnetic devicesen
dc.subjectMEMS devicesen
dc.subjectMagnetic materialsen
dc.subjectExchange couplingsen
dc.subjectMicroarraysen
dc.titleMagnetic performances and switching behavior of Co-rich CoPtP micro-magnets for applications in magnetic MEMSen
dc.typeArticle (peer-reviewed)en
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