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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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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Paramagnetism01:30

Paramagnetism

2.6K
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...
2.6K
Diamagnetism01:26

Diamagnetism

2.5K
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....
2.5K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.3K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.3K
Magnetic Force01:18

Magnetic Force

1.0K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
1.0K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

330
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...
330

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Magnonic Casimir Effect in Ferrimagnets.

Kouki Nakata1, Kei Suzuki1

  • 1Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.

Physical Review Letters
|March 17, 2023
PubMed
Summary

Quantum fluctuations cause the Casimir effect. This study shows the magnonic Casimir effect applies to ferrimagnetic thin films like yttrium iron garnet (YIG), enabling Casimir engineering for spintronics.

Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Spintronics

Background:

  • Quantum fluctuations are fundamental to quantum mechanics.
  • The Casimir effect, a consequence of quantum fluctuations, influences zero-point energy under spatial boundary conditions.
  • The Casimir effect has broad applications, but its use in spintronics, especially with ferrimagnetic thin films, is underexplored.

Purpose of the Study:

  • To investigate the Casimir effect for magnons in insulating magnets.
  • To explore the applicability of the Casimir effect to ferrimagnetic thin films, specifically yttrium iron garnet (YIG).
  • To establish a foundation for magnonic Casimir engineering in spintronics.

Main Methods:

  • Utilizing lattice field theory to model quantum fields.

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  • Analyzing quantum field-induced Casimir effects in magnons within insulating magnetic materials.
  • Examining the Casimir effect in both antiferromagnetic and ferrimagnetic systems.

    • Main Results:

    • The magnonic Casimir effect is demonstrated to occur in ferrimagnetic materials, including yttrium iron garnet (YIG) thin films.
    • Yttrium iron garnet (YIG) is identified as a viable platform for Casimir engineering.
    • Microfabrication techniques allow for the manipulation of the magnonic Casimir effect by controlling thin film thickness.

    Conclusions:

    • The findings extend the understanding of the Casimir effect to magnonic systems in magnetic materials.
    • Yttrium iron garnet (YIG) presents a promising avenue for manipulating Casimir effects within spintronic devices.
    • This research opens possibilities for "Casimir engineering" in magnonics and spintronics.