Spin transfer torque driven higher-order propagating spin waves in nano-contact magnetic tunnel junctions
| Autor: | Seyyed Ruhollah Etesami, Mohammad Haidar, Paulo P. Freitas, Mykola Dvornik, Roman Khymyn, Ajay Gangwar, Ricardo Ferreira, Afshin Houshang, Randy K. Dumas, Himanshu Fulara, Johan Åkerman |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Science
General Physics and Astronomy Giant magnetoresistance 02 engineering and technology 7. Clean energy 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Synchronization (alternating current) Spin wave 0103 physical sciences Nano 010306 general physics lcsh:Science Physics Multidisciplinary Condensed matter physics Spin-transfer torque General Chemistry 021001 nanoscience & nanotechnology Wavelength Transmission (telecommunications) Group velocity lcsh:Q Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 9, Iss 1, Pp 1-6 (2018) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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. Nano-contact-based spin wave generation may enable high-frequency magnonic devices but has been limited to long wavelengths and weak signal strengths. Here the authors demonstrate high-order short-wavelength propagating spin waves with increased transmission rates and propagation lengths in magnetic tunnel junction stacks. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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