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Related Concept Videos

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 Force Between Two Parallel Currents01:13

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...
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.
Ferromagnetism01:31

Ferromagnetism

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...
Types Of Superconductors01:28

Types Of Superconductors

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...
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...

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Updated: May 18, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Ultrafast magnetization enhancement in metallic multilayers driven by superdiffusive spin current.

Dennis Rudolf1, Chan La-O-Vorakiat, Marco Battiato

  • 1Peter Grünberg Institut PGI-6 & JARA-FIT, Research Centre Jülich, 52425 Jülich, Germany.

Nature Communications
|September 6, 2012
PubMed
Summary
This summary is machine-generated.

Ultrafast laser pulses can demagnetize a nickel layer while simultaneously enhancing magnetization in an adjacent iron layer. This surprising effect is driven by a laser-generated superdiffusive spin current between the magnetic layers.

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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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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Area of Science:

  • Condensed matter physics
  • Materials science
  • Ultrafast phenomena

Background:

  • Understanding ultrafast charge and spin dynamics is key for correlated matter and spin electronics.
  • Femtosecond spin dynamics in magnetic materials are initiated by light pulses, causing transient magnetization drops.

Purpose of the Study:

  • To elucidate the physical mechanisms governing ultrafast spin dynamics.
  • To investigate spin dynamics in spatially separated magnetic layers within trilayers.

Main Methods:

  • Utilized Ni/Ru/Fe magnetic trilayers with controllable ferromagnetic or antiferromagnetic coupling.
  • Excited layers with a laser pulse and simultaneously probed magnetization responses in Ni and Fe separately.

Main Results:

  • Observed that optical demagnetization of the Ni layer transiently enhanced Fe layer magnetization when initially parallel.
  • This phenomenon was explained by a laser-generated superdiffusive spin current transferring spin angular momentum between layers.

Conclusions:

  • Demonstrated a novel mechanism for manipulating spin dynamics using layered magnetic structures.
  • The findings offer insights into controlling spin currents for advanced spintronic applications.