All-optical observation and reconstruction of spin wave dispersion

Yusuke Hashimoto (), Shunsuke Daimon, Ryo Iguchi, Yasuyuki Oikawa, Ka Shen, Koji Sato, Davide Bossini, Yutaka Tabuchi, Takuya Satoh, Burkard Hillebrands, Gerrit E. W. Bauer, Tom H. Johansen, Andrei Kirilyuk, Theo Rasing and Eiji Saitoh
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Yusuke Hashimoto: WPI Advanced Institute for Materials Research, Tohoku University
Shunsuke Daimon: WPI Advanced Institute for Materials Research, Tohoku University
Ryo Iguchi: Institute for Materials Research, Tohoku University
Yasuyuki Oikawa: WPI Advanced Institute for Materials Research, Tohoku University
Ka Shen: Kavli Institute of NanoScience, Delft University of Technology
Koji Sato: WPI Advanced Institute for Materials Research, Tohoku University
Davide Bossini: Institute for Photon Science and Technology, Graduate School of Science, The University of Tokyo
Yutaka Tabuchi: Research Center for Advanced Science and Technology, The University of Tokyo
Takuya Satoh: Kyushu University
Burkard Hillebrands: Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern
Gerrit E. W. Bauer: WPI Advanced Institute for Materials Research, Tohoku University
Tom H. Johansen: University of Oslo
Andrei Kirilyuk: Radboud University Nijmegen, Institute for Molecules and Materials
Theo Rasing: Radboud University Nijmegen, Institute for Molecules and Materials
Eiji Saitoh: WPI Advanced Institute for Materials Research, Tohoku University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract To know the properties of a particle or a wave, one should measure how its energy changes with its momentum. The relation between them is called the dispersion relation, which encodes essential information of the kinetics. In a magnet, the wave motion of atomic spins serves as an elementary excitation, called a spin wave, and behaves like a fictitious particle. Although the dispersion relation of spin waves governs many of the magnetic properties, observation of their entire dispersion is one of the challenges today. Spin waves whose dispersion is dominated by magnetostatic interaction are called pure-magnetostatic waves, which are still missing despite of their practical importance. Here, we report observation of the band dispersion relation of pure-magnetostatic waves by developing a table-top all-optical spectroscopy named spin-wave tomography. The result unmasks characteristics of pure-magnetostatic waves. We also demonstrate time-resolved measurements, which reveal coherent energy transfer between spin waves and lattice vibrations.

Date: 2017
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DOI: 10.1038/ncomms15859

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