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Related Concept Videos

Induced Electric Dipoles01:28

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Controlling the Interlayer Dzyaloshinskii-Moriya Interaction by Electrical Currents.

Fabian Kammerbauer1, Won-Young Choi1,2, Frank Freimuth1,3

  • 1Institute of Physics, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany.

Nano Letters
|July 19, 2023
PubMed
Summary

Electric currents can control interlayer Dzyaloshinskii-Moriya interaction (IL-DMI) in synthetic antiferromagnets. This discovery allows for the manipulation of three-dimensional spin textures, like Hopfions, using electrical means.

Keywords:
anomalous Hall effectinterlayer Dzyaloshinskii−Moriya interactionmagnetization switchingspintronicssynthetic antiferromagnet

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Interlayer Dzyaloshinskii-Moriya interaction (IL-DMI) in multilayers with perpendicular magnetic anisotropy promotes spin canting.
  • This interaction is crucial for stabilizing exotic spin textures such as Hopfions.
  • Controlling IL-DMI is essential for nucleating and manipulating these spin textures.

Purpose of the Study:

  • Investigate the influence of electric current on synthetic antiferromagnets exhibiting growth-induced IL-DMI.
  • Quantify the effect of current on IL-DMI.
  • Explore current-induced symmetry breaking for spin texture control.

Main Methods:

  • Utilized out-of-plane hysteresis loops of the anomalous Hall effect.
  • Applied static in-plane magnetic fields at varied azimuthal angles.
  • Analyzed angular dependence to quantify IL-DMI shifts induced by electric current.

Main Results:

  • Observed a shift in azimuthal dependence with increasing current.
  • Identified an additive, current-induced term that linearly increases IL-DMI.
  • Demonstrated current-induced in-plane symmetry breaking.

Conclusions:

  • Electric currents can effectively control IL-DMI in synthetic antiferromagnets.
  • This control enables manipulation of three-dimensional spin textures.
  • Paves the way for electrical control of complex magnetic structures.