Online Spintronics Seminar #80: Burkard Hillebrands

Advances in Coherent Magnonics This online seminar was given on September 24, 2021 by Prof. Burkard Hillebrands of the Technical University of Kaiserslautern. Please refer to https://www.spintalks.org for more information about the Online Spintronics Seminar Series. Magnonics deals with dynamic excitations of magnetically ordered materials. These excitations—magnons—constitute a powerful tool for data processing on the micro and nanoscale. In this talk, I will provide an overview of the fundamentals and current trends in coherent magnonics [1]. I will discuss the implementation in magnetic systems of novel concepts borrowed from integrated optics. Examples are directional couplers and quantum-classical analogy devices, such as a magnonic Stimulated Raman Adiabatic Passage (STIRAP) device [2]. Also, I will address macroscopic quantum phenomena, such as coherent magnon Bose-Einstein condensates [3,4], and will present a way to enable room-temperature quantum computing functionalities using the magnon condensates. [1] P. Pirro, V. I. Vasyuchka, A. A. Serga, and B. Hillebrands, Advances in coherent magnonics, Nat. Rev. Mater. (2021). https://doi.org/10.1038/s41578-021-00... [2] Q. Wang, T. Brächer, M. Fleischhauer, B. Hillebrands, and P. Pirro, Stimulated-Raman-adiabatic-passage mechanism in a magnonic environment, Appl. Phys. Lett. 118, 182404 (2021). [3] M. Mohseni, A. Qaiumzadeh, A. A. Serga, A. Brataas, B. Hillebrands, and P. Pirro, Bose-Einstein condensation of nonequilibrium magnons in confined systems, New J. Phys. 22, 083080 (2020). [4] T. B. Noack, V. I. Vasyuchka, A. Pomyalov, V. S. L'vov, A. A. Serga, and B. Hillebrands, Evolution of room-temperature magnon gas: Toward a coherent Bose-Einstein condensate, Phys. Rev. B 104, L100410 (2021).