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Related Concept Videos

Chirality02:25

Chirality

28.9K
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...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
16.5K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

14.7K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
14.7K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K
Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Chirality-Selected Noncollinear Antiferromagnetic State.

Shijie Xu1,2,3,4,5,6, Bingqian Dai2, Zhizhong Zhang1,5,6

  • 1National Key Laboratory of Spintronics, Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 6, 2025
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated a new method to control the anomalous Hall conductance (AHC) in topological antiferromagnets (AFMs) using vector spin chirality. This chirality-selected approach offers an alternative to magnetic field control for tuning AHC states.

Keywords:
antiferromagnetchiralitymagnetic memoryspintronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Topological antiferromagnets (AFMs) like Mn3Sn show large anomalous Hall conductance (AHC) due to Berry curvature.
  • Conventional control of AHC states relies on magnetic octupole moment reversal via external fields or currents.

Purpose of the Study:

  • To demonstrate an alternative mechanism for controlling AHC in Mn3Sn.
  • To establish a chirality-defined route for controlling noncollinear antiferromagnetic order.

Main Methods:

  • Fabrication of Mn3Sn/Pt heterostructures.
  • Introduction of Fert-Levy-type Dzyaloshinskii-Moriya interaction (DMI) to control lattice chirality.
  • Symmetry analysis and atomistic simulations.

Main Results:

  • Induced DMI successfully switched the vector spin chirality (VSC) from counterclockwise (CCW) to clockwise (CW).
  • This VSC switching resulted in a corresponding inversion of the AHC sign.
  • The polarity inversion was linked to the competition between DMI energy and intrinsic anisotropy.

Conclusions:

  • A novel chirality-selected mechanism for controlling AHC in noncollinear AFMs was demonstrated.
  • DMI engineering is highlighted as a powerful tool for tailoring Berry-curvature-driven transport in AFMs.