Stabilization of a nonlinear magnonic bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by spin-orbit torque

Autor(en)

Michael Schneider, David Breitbach, Rostyslav O. Serha, Qi Wang, Morteza Mohseni, Alexander A. Serga, Andrei N. Slavin, Vasyl S. Tiberkevich, Björn Heinz, Thomas Brächer, Bert Lägel, Carsten Dubs, Sebastian Knauer, Oleksandr Dobrovolskiy, Philipp Pirro, Burkard Hillebrands, Andrii Chumak

Abstrakt

We have recently shown that injection of magnons into a magnetic dielectric via the spin-orbit torque (SOT) effect in the adjacent layer of a heavy metal subjected to the action of short (0.1𝜇⁢s) current pulses allows for control of a magnon Bose-Einstein condensate (BEC). Here, the BEC was formed in the process of rapid cooling (RC), when the electric current heating the sample is abruptly terminated. In the present Letter, we show that the application of a longer (1.0𝜇⁢s) electric current pulse triggers the formation of a nonlinear localized magnonic bullet below the linear magnon spectrum. After pulse termination, the magnon BEC, as before, is formed at the bottom of the linear spectrum, but the nonlinear bullet continues to exist, stabilized for an additional 30 ns by the same process of RC-induced magnon condensation. Our results suggest that a stimulated condensation of excess magnons to all highly populated magnonic states occurs.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Technische Universität Kaiserslautern, Oakland University, Innovent e.V. Technologieentwicklung Jena

Journal

Physical Review B

Band

104

Anzahl der Seiten

6

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.104.L140405

Publikationsdatum

10-2021

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6a6ab730-92ea-4d68-b87a-eaaf2a2d265f