Temporal Evolution of Auto-Oscillations in an Yttrium-Iron-Garnet/Platinum Microdisk Driven by Pulsed Spin Hall Effect-Induced Spin-Transfer Torque

Journal Article · Mon Jan 30 00:00:00 EST 2017 · IEEE Magnetics Letters

DOI:https://doi.org/10.1109/lmag.2017.2661243· OSTI ID:1536625

Lauer, Viktor ^[1]; Schneider, Michael ^[1]; Meyer, Thomas ^[1]; Bracher, Thomas ^[1]; Pirro, Philipp ^[1]; Heinz, Bjorn ^[1]; Heussner, Frank ^[1]; Lagel, Bert ^[1]; Onbasli, Mehmet C. ^[2]; Ross, Caroline A. ^[2]; Hillebrands, Burkard ^[1]; Chumak, Andrii V.  ^[1]

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1. Technische Univ. Kaiserslautern, Kaiserslautern (Germany). Fachbereich Physik and Landesforschungszentrum (OPTIMAS)
2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering

The temporal evolution of pulsed spin Hall effect-spin transfer torque (SHE-STT) driven auto-oscillations in a yttrium iron garnet (YIG)-platinum (Pt) microdisk is studied experimentally using time-resolved Brillouin light scattering spectroscopy. The frequency of the auto-oscillations is different in the center when compared to the edge of the disk and is related to the simultaneous STT excitation of a bullet and a non-localized spin-wave mode. Furthermore, the magnetization precession intensity saturates on a time scale of 20 ns or longer, depending on the current density. For this reason, our findings suggest that a proper ratio between the current and the pulse duration is of crucial importance for future STT-based devices.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0001299
• OSTI ID: 1536625
• Journal Information: IEEE Magnetics Letters, Vol. 8, Issue none; ISSN 1949-307X
• Publisher: IEEE
• Country of Publication: United States
• Language: English

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