Ferromagnetic Resonance of a Single Magnetochiral Metamolecule of Permalloy

Toshiyuki Kodama, Satoshi Tomita, Takeshi Kato, Daiki Oshima, Satoshi Iwata, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Nobuyoshi Hosoito, Hisao Yanagi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We investigate the ferromagnetic resonance (FMR) of a single chiral structure of a ferromagnetic metal - the magnetochiral (MCh) metamolecule. Using a strain-driven self-coiling technique, micrometer-sized MCh metamolecules of metallic permalloy (Py) are fabricated without any residual Py films. The magnetization curves of ten Py MCh metamolecules obtained by an alternating gradient magnetometer show soft magnetic behavior. In cavity FMR with a magnetic-field sweep and coplanar-waveguide (CPW) FMR with a frequency sweep, the Kittel-mode FMR of the single Py metamolecule is observed. The CPW-FMR results, which are consistent with the cavity-FMR results, bring about the effective g factor, effective magnetization, and Gilbert damping of the single metamolecule. Together with calculations using these parameters, the angle-resolved cavity FMR reveals that the magnetization in the Py MCh metamolecule is most likely to be the hollow-bar type of configuration when the external magnetic field is applied parallel to the chiral axis, although the expected magnetization state at remanence is the corkscrew type of configuration.

Original languageEnglish
Article number024016
JournalPhysical Review Applied
Volume6
Issue number2
DOIs
Publication statusPublished - 2016 Aug 24

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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