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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

927
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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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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.
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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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Nonlinear Superconducting Magnetoelectric Effect.

Jin-Xin Hu1, Oles Matsyshyn1, Justin C W Song1

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|February 6, 2025
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Summary
This summary is machine-generated.

We discovered a nonlinear superconducting magnetoelectric (NSM) effect in magnet-superconductor heterostructures. This effect generates spin polarization as a second-order response to supercurrent, offering a new way to control magnetization.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Supercurrent flow in noncentrosymmetric superconductors can induce spin magnetization via the nondissipative magnetoelectric effect.
  • This effect is typically a linear response to supercurrent.

Purpose of the Study:

  • To propose and investigate a nonlinear superconducting magnetoelectric (NSM) effect in magnet-superconductor heterostructures.
  • To explore the potential of NSM for controlling magnetization in superconducting spintronics.

Main Methods:

  • Theoretical investigation of magnet-superconductor heterostructures.
  • Analysis of spin polarization as a second-order response to supercurrent.
  • Examination of NSM in various magnetic materials, including collinear and noncollinear magnets.

Main Results:

  • A nonlinear superconducting magnetoelectric (NSM) effect is proposed and found to manifest in magnet-superconductor heterostructures.
  • NSM generates spin polarization as a second-order response to a driving supercurrent.
  • The NSM effect persists even in centrosymmetric materials and is the leading magnetic response in systems like d-wave altermagnet-superconductor and kagome-superconductor.

Conclusions:

  • The NSM effect provides a powerful, electric, and nondissipative method for controlling magnetization.
  • Magnet-superconductor heterostructures are a promising platform for realizing superconducting spintronics applications through the NSM effect.