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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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Updated: Aug 10, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Shape-memory effect in twisted ferroic nanocomposites.

Donghoon Kim1, Minsoo Kim1, Steffen Reidt2

  • 1Multi-Scale Robotics Lab, Institute of Robotics and Intelligent Systems, ETH Zurich, Tannenstrasse 3, 8092, Zurich, Switzerland.

Nature Communications
|February 10, 2023
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Summary
This summary is machine-generated.

Freestanding twisted ferroic nanocomposites exhibit a giant shape-memory effect with over 8% recoverable strain, overcoming nanoscale limitations of traditional shape-memory alloys for advanced micro-devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Ferroelectric Materials

Background:

  • Shape-memory alloys lose function below ~50 nm, limiting nanoscale applications.
  • Ferroic materials offer modest actuation strain (~1%) via domain switching at the nanoscale.

Purpose of the Study:

  • To develop nanoscale ferroic materials with a significant shape-memory effect.
  • To overcome the size limitations of traditional shape-memory alloys.

Main Methods:

  • Fabrication of freestanding twisted architectures of nanoscale ferroic oxides.
  • Utilizing ferroelectric domain switching for actuation strain.

Main Results:

  • Achieved a giant recoverable strain (>8%) in twisted ferroic nanocomposites.
  • Demonstrated shape-memory effect in nanoscale ferroic materials.

Conclusions:

  • Twisted geometry amplifies strain, surpassing bulk and thin-film limitations.
  • Enables large-stroke shape-memory materials for nanorobots and artificial muscles.