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Related Concept Videos

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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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In-plane reorientation induced single laser pulse magnetization reversal.

Y Peng1, D Salomoni2, G Malinowski3

  • 1Université de Lorraine, CNRS, IJL, F-54000, Nancy, France.

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Single Pulse All Optical Switching is now achievable in diverse rare earth-transition metal multilayers, broadening its applicability. This phenomenon

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Ultrafast Magnetism

Background:

  • Single Pulse All Optical Switching (SP-AOS) was initially demonstrated in GdFeCo ferrimagnets.
  • SP-AOS has been recently extended to specific MnRuGa alloys and Tb/Co multilayers.
  • These materials required precise thickness and composition for switching.

Purpose of the Study:

  • To investigate the generality of SP-AOS in rare earth-transition metal (RE-TM) multilayers.
  • To explore the influence of laser pulse duration on switching threshold.
  • To understand the underlying magnetization reversal mechanisms.

Main Methods:

  • Fabrication of various RE-TM multilayer structures.
  • Characterization of magnetic properties.
  • Ultrafast optical pump-probe experiments using femtosecond laser pulses.
  • Analysis of induced magnetic domain structures.

Main Results:

  • SP-AOS demonstrated across a wide range of RE-TM multilayers, indicating increased generality.
  • Switching threshold fluence was found to be independent of laser pulse duration.
  • Concentric ring domain structures were induced at high laser intensities.
  • In-plane magnetization reorientation was observed.

Conclusions:

  • SP-AOS is a more general phenomenon in RE-TM multilayers than previously thought.
  • The observed features suggest a distinct reversal mechanism compared to Gd-based materials.
  • A precessional reversal mechanism successfully explains the experimental observations, including in-plane reorientation and domain structures.