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Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Mechanical Systems

Mechanical Systems

Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...

Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

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...

Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

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...

Magnetic Force Between Two Parallel Currents

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and the vector product of the length vector along the current element and the field due to the first conductor. According to the...

Torque On A Current Loop In A Magnetic Field

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Related Experiment Video

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Published on: November 21, 2019

Coherent and Dissipative Coupling in a Magnetomechanical System.

P Carrara^1,2, M Brioschi^1,2, R Silvani³

¹Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy.

Physical Review Letters

|June 10, 2024

Summary

This summary is machine-generated.

Researchers explored hybrid elastic and spin waves in magnetic nanostripes. They quantitatively determined the coupling between these quasiparticles, paving the way for energy-efficient magnetic signal technologies.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Hybrid elastic and spin waves offer potential for energy-efficient magnetic signal generation and detection.
Long coherence times are desirable for advanced magnetic technologies.

Purpose of the Study:

To investigate the combined elastic and magnetic dynamics in a one-dimensional magnetomechanical crystal.
To quantitatively determine the coupling mechanisms between phononic and magnonic modes.

Main Methods:

Impulsive excitation of phononic and magnonic modes using an ultrafast optical trigger.
Monitoring mode decay via time-resolved magneto-optical Kerr effect.
Complementary measurements using Brillouin light scattering and micromagnetic simulations.

Main Results:

Demonstrated the simultaneous excitation and decay of elastic (phononic) and magnetic (magnonic) waves.
Quantitatively characterized the strength and degree of mixing between coherent and dissipative coupling.
Established a unified understanding of the coupled dynamics in the magnetomechanical crystal.

Conclusions:

The study provides a quantitative framework for understanding hybrid wave dynamics in magnetomechanical systems.
Findings are crucial for designing future energy-efficient spintronic and magnonic devices.
The developed methods enable precise control and manipulation of coupled quasiparticles.