Microwave Spectroscopy of a Single Permalloy Chiral Metamolecule on a Coplanar Waveguide

Toshiyuki Kodama, Yusaku Kusanagi, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Satoshi Tomita, Nobuyoshi Hosoito, and Hisao Yanagi
Phys. Rev. Applied 9, 054025 – Published 17 May 2018
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Abstract

We investigate the microwave spectroscopies of a micrometer-sized single permalloy (Py) chiral structure on coplanar waveguides (CPWs). Under an external dc magnetic field applied in a direction perpendicular to the microwave propagation, the Py chiral structure loaded on the center of the CPW signal line shows Kittel-mode ferromagnetic resonance. Contrastingly, the structure on the signal-line edge highlights two additional resonances: spin-wave resonance at a higher frequency, and unique resonance at a lower frequency of approximately 7.8 GHz. The resonance signal at 7.8 GHz originates from magnetically induced, geometry-driven resonance, although the resonance frequency does not depend on the external magnetic field. Moreover, the displacement of the Py structures on the signal line results in nonreciprocal microwave transmission, which is traced back to the edge-guide mode.

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  • Received 4 April 2017
  • Revised 8 February 2018

DOI:https://doi.org/10.1103/PhysRevApplied.9.054025

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Interdisciplinary PhysicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Toshiyuki Kodama1, Yusaku Kusanagi2, Satoshi Okamoto2, Nobuaki Kikuchi2, Osamu Kitakami2, Satoshi Tomita1,*, Nobuyoshi Hosoito1, and Hisao Yanagi1

  • 1Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
  • 2Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan

  • *tomita@ms.naist.jp

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Issue

Vol. 9, Iss. 5 — May 2018

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