Unraveling the sign reversal of the anomalous Hall effect in ferromagnet/heavy-metal ultrathin films

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dc.contributor.authorZhang, Yen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorLaGrange, Ten_AU
dc.contributor.authorLee, Wen_AU
dc.contributor.authorButler, Ten_AU
dc.contributor.authorLudbrook, Ben_AU
dc.contributor.authorGranville, Sen_AU
dc.date.accessioned2024-02-28T23:15:11Zen_AU
dc.date.available2024-02-28T23:15:11Zen_AU
dc.date.issued2023-03-01en_AU
dc.date.statistics2024-02-29en_AU
dc.description.abstractThe sign reversal in the anomalous Hall effect (AHE) that occurs for material offers great prospects for AHE-based spintronic devices design. However, the mechanisms are still controversial in ultrathin ferromagnetic/heavy metal thin film systems due to the complicatedly interfacial effects. Here, we investigate the AHE sign reversal in ultrathin ferromagnetic Mn2CoAl/Pd films, a system which has shown unusual AHE, significant spin-orbit coupling, and magnetic texturing. Element-sensitive cross-sectional STEM imaging and the depth-resolved magnetization profile from polarized neutron reflectometry identifies the presence of a second ferromagnetic layer from intermixed Co-Pd. To quantitatively explain the sign reversal of the AHE, we build a model based on two contributions, ferromagnetic Mn2CoAl and the intermixed CoPd layer. We also clarify that contributions to the AHE from magnetic proximity and spin Hall effect are negligible. Our work demonstrates that interfacial alloying can be a critical factor and provides insightful methods to determine the origins of the AHE in ferromagnet/heavy-metal thin film systems. © 2024 American Physical Society.en_AU
dc.identifier.articlenumber094408en_AU
dc.identifier.citationZhang, Y., Cortie, D., LaGrange, T., Lee, W., Butler, T., Ludbrook, B., & Granville, S. (2023). Unraveling the sign reversal of the anomalous Hall effect in ferromagnet/heavy-metal ultrathin films. Physical Review B, 107(9), 094408. doi:10.1103/PhysRevB.107.094408en_AU
dc.identifier.issn2469-9950en_AU
dc.identifier.issn2469-9969en_AU
dc.identifier.issue9en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/physrevb.107.094408en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15482en_AU
dc.identifier.volume107en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectHall effecten_AU
dc.subjectFerromagnetismen_AU
dc.subjectHeavy metalsen_AU
dc.subjectThin Filmsen_AU
dc.subjectMaterialsen_AU
dc.subjectNeutron reflectorsen_AU
dc.subjectSpinen_AU
dc.titleUnraveling the sign reversal of the anomalous Hall effect in ferromagnet/heavy-metal ultrathin filmsen_AU
dc.typeJournal Articleen_AU
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