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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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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 Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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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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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

366
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Related Experiment Video

Updated: Oct 1, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk.

Remko Fermin1, Dyon van Dinter1, Michel Hubert1

  • 1Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.

Nano Letters
|March 3, 2022
PubMed
Summary

Researchers created novel Josephson junctions using a niobium/cobalt (Nb/Co) bilayer to study spin-triplet superconductivity. They discovered long-range triplet correlations emerge at the ferromagnet

Keywords:
FerromagnetismMagnetic textureSuperconductivityTriplet Cooper pairsUsadel theory

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Spintronics

Background:

  • The long-range superconducting proximity effect is crucial for understanding Cooper pair interactions.
  • Experimental studies on spin-triplet Cooper pairs interacting with magnetic structures are limited.

Purpose of the Study:

  • To experimentally investigate the interaction between spin-triplet Cooper pairs and magnetic vortices.
  • To develop nanostructured Josephson junctions with controllable spin texture.

Main Methods:

  • Fabrication of disk-shaped niobium/cobalt (Nb/Co) bilayer Josephson junctions.
  • Utilizing vortex magnetization in cobalt to induce superconductivity in niobium.
  • Characterizing the emergence of long-range triplet (LRT) superconductivity.

Main Results:

  • LRT superconductivity was induced in the ferromagnet by the interplay of Nb Cooper pairs and Co vortex magnetization.
  • Robust LRT correlations were observed in localized (sub-80 nm) channels at the ferromagnet's rim.
  • Magnetization texture was identified as an effective spin-orbit coupling mechanism, causing spin accumulation.

Conclusions:

  • The study demonstrates a novel mechanism for generating LRT superconductivity in ferromagnets.
  • Device spin texture can be manipulated to achieve both 0 and π superconducting channels.
  • This work opens new avenues for spintronic devices utilizing superconductivity.