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Spin transfer torque driven higher-order propagating spin waves in nano-contact magnetic tunnel junctions

Journal article
Authors Afshin Houshang
Roman Khymyn
Himanshu Fulara
Ajay Gangwar
Mohammad Haidar
Seyyed Etesami
R. Ferreira
P. P. Freitas
Mykola Dvornik
Randy K. Dumas
Johan Åkerman
Published in Nature Communications
Volume 9
Publication year 2018
Published at Department of Physics (GU)
Language en
Subject categories Condensed Matter Physics


© 2018, The Author(s). 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.

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