Magnetic droplet solitons in orthogonal spin valves
We review the recent experimental advancements in the realization and understanding of magnetic droplet solitons generated by spin transfer torque in orthogonal nanocontact based spin torque nanooscillators (STNOs) fabricated on extended spin valves and spin valve nanowires. The magnetic droplets...
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| Datum: | 2015 |
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| Hauptverfasser: | , , , , , , , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2015
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| Schriftenreihe: | Физика низких температур |
| Schlagworte: | |
| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/128089 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Magnetic droplet solitons in orthogonal spin valves / S.Chung, S.M. Mohseni, A. Eklund, P. Dürrenfeld, M. Ranjbar, S.R. Sani, T.N.A. Nguyen, R.K. Dumas, J. Åkerman // Физика низких температур. — 2015. — Т. 41, № 10. — С. 1063–1068. — Бібліогр.: 62 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | We review the recent experimental advancements in the realization and understanding of magnetic droplet
solitons generated by spin transfer torque in orthogonal nanocontact based spin torque nanooscillators (STNOs)
fabricated on extended spin valves and spin valve nanowires. The magnetic droplets are detected and studied using
the STNO microwave signal and its resistance, the latter both quasistatically and time-resolved. The droplet
nucleation current is found to have a minimum at intermediate magnetic field strengths and the nature of the nucleation
changes gradually from a single sharp step well above this field, mode-hopping around the minimum,
and continuous at low fields. The mode-hopping and continuous transitions are ascribed to droplet drift instability
and re-nucleation at different time scales, which is corroborated by time-resolved measurements. We argue
that the use of tilted anisotropy fixed layers could reduce the nucleation current further, move the nucleation current
minimum to lower fields, and potentially remove the need for an applied magnetic field altogether. Finally,
evidence of an edge mode droplet in a nanowire is presented. |
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