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Related Concept Videos

Superconductor01:24

Superconductor

1.5K
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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Types Of Superconductors01:28

Types Of Superconductors

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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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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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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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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.4K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Magnetic Fields01:27

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.
A magnetic field is defined by the force that a charged particle experiences...
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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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Self-consistent solution for the magnetic exchange interaction mediated by a superconductor.

Atousa Ghanbari1, Vetle K Risinggård1, Jacob Linder2

  • 1Department of Physics, Center for Quantum Spintronics, Norwegian University of Science and Technology, 7491, Trondheim, Norway.

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We found that superconductivity can alter magnetic interactions between ferromagnets. The anti-parallel alignment becomes the ground state, despite parallel alignment yielding higher superconducting energy.

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Area of Science:

  • Condensed Matter Physics
  • Solid State Physics
  • Quantum Materials

Background:

  • Understanding magnetic exchange interactions is crucial for spintronic devices.
  • Superconductors can mediate long-range magnetic coupling between ferromagnets.
  • The interplay between superconductivity and magnetism is a key area of research.

Purpose of the Study:

  • To theoretically investigate the magnetic exchange interaction between two ferromagnets coupled by a superconductor.
  • To analyze the influence of the self-consistent superconducting state on magnetic ground states.
  • To explore the role of impurity scattering in this coupled system.

Main Methods:

  • Utilizing a tight-binding lattice model for theoretical calculations.
  • Self-consistently solving for the superconducting state.
  • Analyzing the magnetic exchange interaction and ground state configurations.

Main Results:

  • Superconducting state suppresses RKKY-like oscillations for large superconducting gaps, favoring anti-parallel alignment.
  • Parallel magnetic alignment results in a larger superconducting gap and condensation energy than anti-parallel alignment.
  • Increased impurity concentration in the superconductor weakens the magnetic exchange interaction.

Conclusions:

  • Superconductivity significantly modifies magnetic coupling, often favoring anti-parallel alignment.
  • A trade-off exists between magnetic ground state preference and superconducting energy.
  • Impurity scattering diminishes the magnetic exchange interaction by localizing quasiparticles.