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Micromagnetic Modeling of Telegraphic Mode Jumping in Microwave Spin Torque Oscillators
KTH, School of Electrical Engineering and Computer Science (EECS), Electronics. (Variability and Fluctuations)ORCID iD: 0000-0001-6459-749X
KTH, School of Electrical Engineering and Computer Science (EECS), Electronics.ORCID iD: 0000-0003-1271-1814
Gothenburg University, Department of Physics .
2019 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The time domain stability of microwave spin torque oscillators (STOs) has been investigated by systematic micromagnetic simulations. A model based on internal spin wave reflection at grain boundaries with reduced exchange coupling was implemented and used to study the oscillator under quasi-stable operating conditions. Telegraphic mode jumping between two operating frequencies (23.3 and 24.1 GHz) was observed in the time domain with characteristic dwell times in the range of 10-100 ns. The oscillating volume was shown to have a different shape at the distinct operating frequencies. The shape difference is governed by spin wave reflections at the grain boundaries. The resulting non-linear behavior of the oscillator was shown to be a collective effect of spin wave scattering at different locations within a few spin wavelengths from the nano-contact.

Place, publisher, year, edition, pages
2019.
Keywords [en]
telegraphic mode jumping, micromagnetic simulations, microwave oscillators, spin transfer torque
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-259582OAI: oai:DiVA.org:kth-259582DiVA, id: diva2:1352296
Conference
25th International Conference on Noise and Fluctuations – ICNF 2019
Projects
Fundamental Fluctuations in Spintronics
Funder
Swedish Research Council, 2017-04196
Note

QC 20190924

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-09-25Bibliographically approved

Open Access in DiVA

fulltext(788 kB)2 downloads
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CiteExportLink to record
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