4.8 Article

Spontaneous Exact Spin-Wave Fractals in Magnonic Crystals

Journal

PHYSICAL REVIEW LETTERS
Volume 121, Issue 10, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.107204

Keywords

-

Funding

  1. U.S. National Science Foundation [DMR-1407962, EFMA-1641989]
  2. SHINES, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [SC0012670]
  3. National Science Foundation [PHY-1520915, OAC-1740130]
  4. U.S. Air Force Office of Scientific Research [FA9550-14-1-0287]
  5. Direct For Mathematical & Physical Scien
  6. Division Of Physics [1520915] Funding Source: National Science Foundation

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Exact fractals of nonlinear waves that rely on strong dispersion and nonlinearity and arise spontaneously out of magnetic media were observed for the first time. The experiments make use of a microwave to excite a spin wave in a quasi-one-dimensional magnonic crystal. When the power of the input microwave (P-in) is low, the output signal has a power-frequency spectrum that consists of a single peak. When P-in is increased to a certain level, new side modes are generated through modulational instability, resulting in a comblike frequency spectrum. With a further increase in P-in, each peak in the frequency comb can evolve into its own finer comb through the modulational instability. As P-in is increased further, one can observe yet another set of finer frequency combs. Such a frequency-domain fractal manifests itself as multiple layers of amplitude modulation in the time-domain signal.

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