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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Enhanced transmission through squeezed modes in a self-cladding magnonic waveguide.

G Duerr1, K Thurner, J Topp

  • 1Physik Department, Lehrstuhl für Physik funktionaler Schichtsysteme, Technische Universität München, James-Franck-Straße 1, Garching b. München D-85747, Germany.

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|September 26, 2012
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Summary

Spin waves propagate efficiently in NiFe nanowires through self-cladding channels. Field rotation modulates spin-wave velocity, enabling potential applications in novel electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Spin waves are fundamental excitations in magnetic materials.
  • Controlling spin-wave propagation is crucial for developing magnonic devices.
  • Nickel-iron (NiFe) alloys are promising for spintronic applications.

Purpose of the Study:

  • To investigate spin-wave propagation in NiFe nanowires.
  • To explore the effect of magnetization states on spin-wave transmission.
  • To demonstrate field-controlled modulation of spin-wave velocity.

Main Methods:

  • All-electrical spin-wave spectroscopy was employed.
  • Micromagnetic simulations were used to analyze spin-wave behavior.
  • Nanowires with a width of 360 nm were fabricated from Ni(80)Fe(20).

Main Results:

  • A zigzag magnetization state enhanced spin-wave transmission compared to homogeneous states.
  • Spin waves propagated in internal channels, demonstrating field-controlled self-cladding.
  • Rotation of the magnetic field modulated spin-wave velocity without altering eigenfrequency.

Conclusions:

  • Self-cladding in NiFe nanowires facilitates efficient spin-wave propagation.
  • Field-controlled velocity modulation offers a new pathway for magnonic device design.
  • This research paves the way for velocity modulation transistors in spintronics.