Cloaking the magnons

Mehrdad Elyasi, Charanjit S. Bhatia, Cheng Wei Qiu, Hyunsoo Yang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We propose two approaches to cloak the spin waves (magnons) by investigating magnetization dynamics. One approach is based on a spatially inhomogeneous anisotropic magnetic moment tensor. The other mechanism is using a spatially inhomogeneous anisotropic gyromagnetic factor tensor and an inhomogeneous external magnetic field. For both approaches, the damping tensor is also inhomogeneous and anisotropic. The magnetic characteristic functions of the magnetic materials have been theoretically derived for both mechanisms. A nonmagnetic core, which prevents magnons from entering and consequently distorts the spin-wave propagation, can be cloaked by a structured magnetic shell to redirect the spin wave around the core using the above design mechanisms. We discuss the feasibility of the proposed mechanisms in an ensemble of quantum dot molecules and magnetic semiconductors. The proposed approaches shed light on transformation magnonics, and can be utilized for future spin-wave lenses, concentrators, low backscattering waveguides, and ultimately quantum computing.

Original languageEnglish
Article number104418
JournalPhysical Review B
Volume93
Issue number10
DOIs
Publication statusPublished - 2016 Mar 21
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Elyasi, M., Bhatia, C. S., Qiu, C. W., & Yang, H. (2016). Cloaking the magnons. Physical Review B, 93(10), [104418]. https://doi.org/10.1103/PhysRevB.93.104418