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Observation of a Chirality-Induced Exchange-Bias Effect
Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany.
Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
Oak Ridge Natl Lab, Neutron Scattering Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2019 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 12, no 2, article id 024047Article in journal (Refereed) Published
Abstract [en]

Chiral magnetism that manifests in the existence of skyrmions or chiral domain walls offers an alternative way for creating anisotropies in magnetic materials that might have large potential for application in future spintronic devices. Here we show experimental evidence for an alternative type of in-plane exchange-bias effect present at room temperature that is created from a chiral 90 degrees domain wall at the interface of a ferrimagnetic-ferromagnetic Dy-Co/Ni-Fe bilayer system. The chiral interfacial domain wall forms due to the exchange coupling of Ni-Fe and Dy-Co at the interface and the presence of Dzyaloshinskii-Moriya interaction in the Dy-Co layer. As a consequence of the preferred chirality of the interfacial domain wall, the sign of the exchange-bias effect can be reversed by changing the perpendicular orientation of the Dy-Co magnetization. The chirality-created tunable exchange bias in Dy-Co/Ni-Fe is very robust against high in-plane magnetic fields (mu H-0 <= 6 T) and does not show any aging effects. Therefore, it overcomes the limitations of conventional exchange-bias systems.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 12, no 2, article id 024047
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-393725DOI: 10.1103/PhysRevApplied.12.024047ISI: 000482216100002OAI: oai:DiVA.org:uu-393725DiVA, id: diva2:1354964
Funder
German Research Foundation (DFG), 615811German Research Foundation (DFG), SFB925Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2019-09-26Bibliographically approved

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Vorobiev, Alexei

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