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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Paramagnetism01:30

Paramagnetism

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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...
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Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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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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Light-Induced Magnetization at the Nanoscale.

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Scientists developed a new laser technique to create tiny magnetic moments using atomic-scale charge current loops. This ultrafast, noninvasive method offers nanoscale control for spintronics and quantum information applications.

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Area of Science:

  • Quantum physics
  • Materials science
  • Laser technology

Background:

  • Controlling magnetic moments at the nanoscale is crucial for advanced technologies like spintronics and quantum information.
  • Existing methods for ultrafast, noninvasive nanoscale magnetic control remain a significant scientific challenge.

Purpose of the Study:

  • To propose and demonstrate a novel laser-based scheme for generating and controlling atomic-scale charge current loops.
  • To achieve ultrafast, noninvasive generation of localized, ferromagnetically aligned orbital magnetic moments.

Main Methods:

  • Utilizing two copropagating laser pulses (Gaussian and vortex) with controlled phase, polarization, and intensity.
  • Inducing atomic-scale charge current loops in a sample (Helium atoms) via photon absorption.
  • Employing ab initio quantum dynamic simulations and experimental photoemission measurements.

Main Results:

  • Successfully generated atomic-scale charge current loops and localized orbital magnetic moments.
  • Demonstrated control over the spatial extent, direction, and strength of these current loops using laser parameters.
  • Observed persistent ferromagnetic alignment of magnetic moments after laser pulse termination.

Conclusions:

  • The proposed laser-driven scheme provides an effective method for ultrafast, noninvasive nanoscale magnetic moment generation.
  • The technique allows for tunable control of magnetic properties, paving the way for new spintronic and quantum devices.
  • Experimental and simulation results confirm the viability and potential of this approach.