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Spin transfer torque driven higher-order propagating spin waves in nano-contact magnetic tunnel junctions
Univ Gothenburg, Phys Dept, S-41296 Gothenburg, Sweden.;NanOsc AB, S-16440 Kista, Sweden..
Univ Gothenburg, Phys Dept, S-41296 Gothenburg, Sweden..
Univ Gothenburg, Phys Dept, S-41296 Gothenburg, Sweden..
Univ Gothenburg, Phys Dept, S-41296 Gothenburg, Sweden..
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 4374Article in journal (Refereed) Published
Abstract [en]

Short wavelength exchange-dominated propagating spin waves will enable magnonic devices to operate at higher frequencies and higher data transmission rates. While giant magnetoresistance (GMR)-based magnetic nanocontacts are efficient injectors of propagating spin waves, the generated wavelengths are 2.6 times the nano-contact diameter, and the electrical signal strength remains too weak for applications. Here we demonstrate nano-contact-based spin wave generation in magnetic tunnel junctions and observe large-frequency steps consistent with the hitherto ignored possibility of second-and third-order propagating spin waves with wavelengths of 120 and 74 nm, i.e., much smaller than the 150-nm nanocontact. Mutual synchronization is also observed on all three propagating modes. These higher-order propagating spin waves will enable magnonic devices to operate at much higher frequencies and greatly increase their transmission rates and spin wave propagating lengths, both proportional to the much higher group velocity.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 9, article id 4374
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Physical Sciences
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URN: urn:nbn:se:kth:diva-238533DOI: 10.1038/s41467-018-06589-0ISI: 000447840500004PubMedID: 30348986Scopus ID: 2-s2.0-85055159988OAI: oai:DiVA.org:kth-238533DiVA, id: diva2:1260986
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QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2019-03-18Bibliographically approved

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Åkerman, Johan

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