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2. Ultra-Fast Perpendicular Spin–Orbit Torque MRAM

Author

Cubukcu, Murat, primary, Boulle, Olivier, additional, Mikuszeit, Nikolai, additional, Hamelin, Claire, additional, Bracher, Thomas, additional, Lamard, Nathalie, additional, Cyrille, Marie-Claire, additional, Buda-Prejbeanu, Liliana, additional, Garello, Kevin, additional, Miron, Ioan Mihai, additional, Klein, O., additional, de Loubens, G., additional, Naletov, V. V., additional, Langer, Juergen, additional, Ocker, Berthold, additional, Gambardella, Pietro, additional, and Gaudin, Gilles, additional

Published
2018
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4. Temporal Evolution of Auto-Oscillations in an Yttrium-Iron-Garnet/Platinum Microdisk Driven by Pulsed Spin Hall Effect-Induced Spin-Transfer Torque

Author

Massachusetts Institute of Technology. Department of Materials Science and Engineering, Onbasli, Mehmet Cengiz, Ross, Caroline A, Lauer, Viktor, Schneider, Michael, Meyer, Thomas, Bracher, Thomas, Pirro, Philipp, Heinz, Bjorn, Heussner, Frank, Lagel, Bert, Hillebrands, Burkard, Chumak, Andrii V., Massachusetts Institute of Technology. Department of Materials Science and Engineering, Onbasli, Mehmet Cengiz, Ross, Caroline A, Lauer, Viktor, Schneider, Michael, Meyer, Thomas, Bracher, Thomas, Pirro, Philipp, Heinz, Bjorn, Heussner, Frank, Lagel, Bert, Hillebrands, Burkard, and Chumak, Andrii V.

Abstract

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., Solid-State Solar-Thermal Energy Conversion Center (Award DE-SC0001299)

Published
2017

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

Author

Lauer, Viktor, primary, Schneider, Michael, additional, Meyer, Thomas, additional, Bracher, Thomas, additional, Pirro, Philipp, additional, Heinz, Bjorn, additional, Heussner, Frank, additional, Lagel, Bert, additional, Onbasli, Mehmet C., additional, Ross, Caroline A., additional, Hillebrands, Burkard, additional, and Chumak, Andrii V., additional

Published
2017
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8. Optical determination of the exchange stiffness constant in an iron garnet

Author

Matsumoto, Keita, Bracher, Thomas, Pirro, Philipp, Fischer, Tobias, Bozhko, Dmytro, Geilen, Moritz, Heussner, Frank, Meyer, Thomas, Hillebrands, Burkard, and Satoh, Takuya

Abstract

Brillouin light scattering measurements were performed in the backscattering geometry on a Bi-substituted rare earth iron garnet. We observed two different peaks: One is attributed to a surface spin wave in the dipole-exchange regime while the other is referred to as a backscattering magnon mode, because the incident light in this case was scattered backward by exchange-dominated spin wave inside the material. We propose a method to estimate the exchange stiffness constant from the frequency of the backscattering magnon mode. The obtained value is comparable with the previously reported values for Y3Fe5O12.

Published
2018

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