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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Superfluid spin transport through easy-plane ferromagnetic insulators.

So Takei1, Yaroslav Tserkovnyak1

  • 1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

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|June 21, 2014
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Summary

This study explores dissipationless spin transport in ferromagnetic insulators. Researchers propose a method to probe spin superfluidity using a negative electron-drag experiment.

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Area of Science:

  • Condensed matter physics
  • Spintronics

Background:

  • Superfluid spin transport offers dissipationless spin current propagation.
  • Ferromagnetic insulators with easy-plane anisotropy are potential candidates for hosting such phenomena.

Purpose of the Study:

  • To theoretically investigate superfluid spin transport in a ferromagnetic insulator.
  • To propose experimental methods for probing spin superfluidity.

Main Methods:

  • Utilizing magnetoelectric circuit theory.
  • Applying Landau-Lifshitz-Gilbert phenomenology.
  • Employing microscopic linear-response theory.

Main Results:

  • Theoretical framework for superfluid spin transport established.
  • Open geometry with metallic reservoirs considered for spin injection and ejection.
  • A magnetically mediated negative electron-drag experiment proposed as a probing method.

Conclusions:

  • Spin superfluidity is theoretically feasible in ferromagnetic insulators.
  • The proposed experiment offers a viable route for experimental verification.