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Related Concept Videos

Magnetic Damping01:17

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...
Diamagnetism01:26

Diamagnetism

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.
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Potential Due to a Magnetized Object01:24

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...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

Current driven magnetic damping in dipolar-coupled spin system.

Sung Chul Lee1, Ung Hwan Pi, Keewon Kim

  • 1Samsung Advanced Institute of Technology-SAIT, San #14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-Do 446-712, Korea.

Scientific Reports
|July 27, 2012
PubMed
Summary
This summary is machine-generated.

Dipolar coupling in spintronic devices significantly impacts magnetic damping. This study reveals enhanced damping in coupled spin systems, controllable via external magnetic fields.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Magnetic damping, the rate of spin decay, is controllable via spin transfer torque, enabling phenomena like current-driven magnetization reversal.
  • Spintronic devices typically utilize free and pinned magnetic layers.

Purpose of the Study:

  • To investigate the impact of dipolar coupling between magnetic layers on current-driven spin dynamics.
  • To explore novel methods for controlling magnetic damping in spintronic systems.

Main Methods:

  • Experimental investigation of magnetic damping in a coupled spin system.
  • Analysis of spin dynamics considering dipolar interactions between layers.

Main Results:

  • Dipolar coupling between free and pinned layers significantly affects spin dynamics, contrary to previous assumptions.
  • Magnetic damping was greatly enhanced in the coupled spin system at a specific external magnetic field.
  • Observed damping enhancement could not be explained by considering each layer's spin dynamics independently.

Conclusions:

  • Dipolar coupling plays a critical role in the magnetic damping of spintronic devices.
  • External magnetic fields can be used to actively control the magnetic damping of dipolar-coupled spin systems.
  • This finding opens new avenues for designing and optimizing spintronic devices.