Spatially confined magnetic shape-memory Heuslers: Implications for nanoscale devices

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dc.contributor.authorTakhsha Ghahfarokhi, Miladcs
dc.contributor.authorHorký, Michalcs
dc.contributor.authorNasi, Luciacs
dc.contributor.authorKosogor, Annacs
dc.contributor.authorTrevisi, Giovannacs
dc.contributor.authorCasoli, Francescacs
dc.contributor.authorArregi Uribeetxebarria, Jon Andercs
dc.contributor.authorBrescia, Rosariacs
dc.contributor.authorUhlíř, Vojtěchcs
dc.contributor.authorAlbertini, Francacs
dc.coverage.issue1cs
dc.coverage.volume284cs
dc.date.issued2025-01-01cs
dc.description.abstractMagnetic shape-memory (MSM) Heuslers are among the most promising materials for thermo-magneto-mechanical applications. However, the knowledge about the martensitic transformation (which is the basis of the multifunctionality in these materials) as a function of size reduction in the submicron scale is still very limited. Here, we aim to bridge this knowledge gap by investigating the behavior of these materials upon nanoscale confinement. We customize a top-down approach by patterning arrays of submicron epitaxial Ni-Mn-Ga structures with lateral sizes down to similar to 70 nm, using a Cr hard mask on MgO(001) substrate. The structures include straight stripes, radial stripes, squares and triangles. The martensitic transformation temperature, sharpness, thermal hysteresis and magnetic characteristics of the material are investigated upon spatial confinement. Transmission electron microscopy techniques including Geometric Phase Analysis (GPA) algorithm, and quantitative theoretical analysis of stress help us to evaluate the martensitic transformation of Ni-Mn-Ga starting from continuous films and down to sub-micron patterns. We show that the size-dependent internal stress relaxation plays a primary role in broadening the martensitic transformation of the material, reducing thermal hysteresis, and pushing the transformation toward higher temperatures in the sub-micron structures. These findings highlight the importance of stress considerations upon incorporation of MSM Heusler materials into nanoscale functional devices.en
dc.formattextcs
dc.format.extent1-11cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationACTA MATERIALIA. 2025, vol. 284, issue 1, p. 1-11.en
dc.identifier.doi10.1016/j.actamat.2024.120579cs
dc.identifier.issn1873-2453cs
dc.identifier.orcid0000-0003-1734-9789cs
dc.identifier.orcid0000-0002-7376-2757cs
dc.identifier.orcid0000-0002-0512-6329cs
dc.identifier.other197793cs
dc.identifier.researcheridJ-3972-2018cs
dc.identifier.researcheridM-9810-2016cs
dc.identifier.researcheridE-6860-2011cs
dc.identifier.scopus55248382600cs
dc.identifier.urihttp://hdl.handle.net/11012/250904
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofACTA MATERIALIAcs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S1359645424009273cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1873-2453/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectMagnetic shape memory alloysen
dc.subjectHeusler alloysen
dc.subjectMartensitic phase transformationen
dc.subjectLithographyen
dc.subjectNanofabricationen
dc.titleSpatially confined magnetic shape-memory Heuslers: Implications for nanoscale devicesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.grantNumberinfo:eu-repo/grantAgreement/MSM/LM/LM2023051cs
sync.item.dbidVAV-197793en
sync.item.dbtypeVAVen
sync.item.insts2025.06.05 10:57:06en
sync.item.modts2025.06.05 10:33:29en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav fyzikálního inženýrstvícs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Nanomagnetismus a spintronikacs
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Ústav fyzikálního inženýrství
Nanomagnetismus a spintronika