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Mechanical manipulation for ordered topological defects.

Ziyan Gao1, Yixuan Zhang1, Xiaomei Li2

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Researchers developed a mechanical strategy to align topological defects in hexagonal manganites. This method uses nanoindentation and scratching to transform random defects into ordered patterns, offering control over domain networks.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Topological defects, formed during spontaneous symmetry breaking, are crucial for understanding material properties.
  • Manipulating these topologically protected defects into ordered structures remains a significant challenge.

Purpose of the Study:

  • To establish a mechanical strategy for aligning topological domain networks in hexagonal manganites.
  • To demonstrate the transformation of randomly distributed topological defects into ordered forms.

Main Methods:

  • Applying mechanical strain through nanoindentation and scratching on hexagonal manganites.
  • Analyzing the resulting domain patterns and defect manipulation.

Main Results:

  • Nanoindentation strain induced a threefold Magnus-type force, creating sixfold symmetric domain patterns by directing vortex and antivortex motion.
  • Expanding nanoindentation to scratching successfully achieved sizeable mono-chirality topological stripes from random defects.

Conclusions:

  • A novel mechanical approach effectively manipulates topological defects in hexagonal manganites.
  • This strategy offers a pathway to control topological domains across various material classes, including ferroelectrics, ferromagnets, antiferromagnets, and ferroelastics.