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Related Concept Videos

Chirality02:25

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

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Measuring domain wall fidelity lengths using a chirality filter.

E R Lewis1, D Petit, A-V Jausovec

  • 1Department of Physics, Imperial College London, Prince Consort Road, London SW7 2BW, United Kingdom.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Researchers studied domain wall (DW) movement in Permalloy nanowires. They discovered a minimum distance, the "DW fidelity length," over which structural changes occur, consistent with theoretical models.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Transverse domain walls (DWs) are fundamental magnetic structures in low-dimensional magnetic systems.
  • Understanding DW dynamics is crucial for developing advanced magnetic memory and logic devices.
  • Permalloy nanowires are a key platform for studying DW motion due to their well-defined magnetic properties.

Purpose of the Study:

  • To investigate the motion and structural integrity of transverse domain walls (DWs) in thin Permalloy nanowires.
  • To identify and characterize the minimum distance over which DW structural changes occur, termed the 'DW fidelity length.'
  • To explore methods for extending this fidelity length to macroscopic scales.

Main Methods:

  • Utilized a cross-shaped trap as a chirality filter to locally detect the chirality of moving DWs.
  • Measured the field dependence of the DW fidelity length.
  • Employed a series of filters to demonstrate the extension of DW fidelity length.

Main Results:

  • Discovered that structural changes in DWs occur over a characteristic minimum distance, the DW fidelity length.
  • Observed that the measured field dependence of the fidelity length aligns well with a 1D analytical model.
  • Demonstrated qualitative agreement with published numerical simulations and experimental results.
  • Successfully extended the DW fidelity length to meter-length scales.

Conclusions:

  • The DW fidelity length is a critical parameter governing DW structural integrity in nanowires.
  • The findings support the validity of the 1D analytical model for DW motion and structural changes.
  • The demonstrated method offers a pathway for controlling DW behavior over extended distances, relevant for spintronic applications.