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Interfacial Dzyaloshinskii-Moriya Interaction in Pt/CoFeB Films: Effect of the Heavy-Metal Thickness
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 14, article id 147201Article in journal (Refereed) Published
Abstract [en]

We report the observation of a Pt layer thickness dependence on the induced interfacial DzyaloshinskiiMoriya interaction in ultrathin Pt(d(Pt))/CoFeB films. Taking advantage of the large spin-orbit coupling of the heavy metal, the interfacial Dzyaloshinskii-Moriya interaction is quantified by Brillouin light scattering measurements of the frequency nonreciprocity of spin waves in the ferromagnet. The magnitude of the induced Dzyaloshinskii-Moriya coupling is found to saturate to a value of 0.45 mJ/m(2) for Pt thicknesses larger than similar to 2 nm. The experimental results are explained by analytical calculations based on the three-site indirect exchange mechanism that predicts a Dzyaloshinskii-Moriya interaction at the interface between a ferromagnetic thin layer and a heavy metal. Our findings open up a way to control and optimize chiral effects in ferromagnetic thin films through the thickness of the heavy-metal layer.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 118, no 14, article id 147201
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-208252DOI: 10.1103/PhysRevLett.118.147201ISI: 000399395500011PubMedID: 28430498Scopus ID: 2-s2.0-85017124834OAI: oai:DiVA.org:kth-208252DiVA, id: diva2:1114900
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research EU, FP7, Seventh Framework Programme, 307144
Note

QC 20170626

Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2017-06-30Bibliographically approved

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Åkerman, Johan

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