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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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Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

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The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
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Diamagnetism01:26

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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.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Related Experiment Video

Updated: Dec 7, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Curvilinear One-Dimensional Antiferromagnets.

Oleksandr V Pylypovskyi1,2, Denys Y Kononenko2,3, Kostiantyn V Yershov3,4

  • 1Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, Dresden 01328, Germany.

Nano Letters
|September 28, 2020
PubMed
Summary
This summary is machine-generated.

We introduce curvilinear antiferromagnetism, using geometry to control material properties. This novel approach enables geometrically tunable chiral antiferromagnets for advanced spintronics and fundamental physics discoveries.

Keywords:
Dzyaloshinskii−Moriya interactionantiferromagnetismcoherent magnon excitationscurvilinear spin chainspin−orbitronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Antiferromagnets are crucial for spintronics and spin-orbitronics due to exotic quasiparticles and high-frequency excitations.
  • Current methods rely on adjusting material parameters to control antiferromagnetic properties.

Purpose of the Study:

  • To propose and investigate the concept of curvilinear antiferromagnetism.
  • To demonstrate how geometrical curvature can tailor material responses without altering intrinsic parameters.
  • To explore the potential for geometrically tunable chiral antiferromagnets.

Main Methods:

  • Theoretical modeling of one-dimensional (1D) curvilinear antiferromagnets.
  • Analysis of spin wave modes and Dzyaloshinskii-Moriya interaction (DMI) in curved geometries.
  • Investigating the impact of curvature on the Néel vector orientation and low-frequency spin wave modes.

Main Results:

  • An intrinsically achiral 1D curvilinear antiferromagnet exhibits chiral helimagnetic behavior.
  • Geometrical curvature induces a tunable Dzyaloshinskii-Moriya interaction (DMI).
  • Curvature-induced DMI leads to spin wave mode hybridization and a geometrically driven minimum in the low-frequency branch.

Conclusions:

  • Curvilinear 1D antiferromagnets offer a new platform for creating geometrically tunable chiral systems.
  • This approach is promising for advancements in antiferromagnetic spin-orbitronics.
  • Potential for fundamental discoveries in coherent magnon condensates and novel spintronic devices.