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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Electrically driven magnetic antenna based on multiferroic composites.

X-G Wang1, A Sukhov, L Chotorlishvili

  • 1Institut für Physik, Martin-Luther Universität Halle-Wittenberg, 06099 Halle (Saale), Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 23, 2016
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Summary
This summary is machine-generated.

We developed an electrically controlled spin-wave inducer using multiferroic junctions. This device generates spin waves in ferromagnets via electric fields, offering new possibilities for spintronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Spin waves are fundamental excitations in magnetic materials.
  • Controlling spin waves with electric fields is crucial for energy-efficient spintronics.
  • Multiferroic materials offer coupled magnetic and electric properties.

Purpose of the Study:

  • To propose and demonstrate an electrically operated spin-wave inducer.
  • To investigate the use of composite multiferroic junctions for spin-wave generation.
  • To analyze the influence of geometry and material properties on device performance.

Main Methods:

  • Large-scale numerical simulations were employed.
  • An interfacially coupled ferromagnetic/ferroelectric structure was modeled.
  • The effect of external electric fields on ferroelectric polarization was simulated.

Main Results:

  • Demonstrated controllable spin-wave emission from ferromagnets.
  • Showcased the functionality of the multiferroic junction as a spin-wave inducer.
  • Identified key geometric and material parameters influencing spin-wave generation.

Conclusions:

  • Electrically driven spin-wave generation is feasible using multiferroic heterostructures.
  • The proposed device offers a pathway for novel spintronic devices.
  • Further research into material optimization and device design is warranted.