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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just 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...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
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...

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Related Experiment Video

Updated: May 31, 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

Visualization of spin dynamics in single nanosized magnetic elements.

A Banholzer1, R Narkowicz, C Hassel

  • 1Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Duisburg, Germany.

Nanotechnology
|June 23, 2011
PubMed
Summary
This summary is machine-generated.

Understanding spin relaxation in nanomagnets is key for spintronics. Ferromagnetic resonance precisely analyzes magnetic properties and spin wave modes in nanostructures.

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Area of Science:

  • Spintronics and Nanomagnetism
  • Materials Science
  • Condensed Matter Physics

Background:

  • Designing advanced spintronic devices necessitates a deep understanding of spin relaxation mechanisms.
  • Magnetization reversal in nanometer-scale ferromagnetic systems is governed by microscopic linear and nonlinear spin relaxation processes.

Purpose of the Study:

  • To quantitatively analyze spin relaxation rates, magnetic anisotropy, and susceptibility in nanometer-scale ferromagnetic systems.
  • To investigate the excitation modes in single nanometer-sized ferromagnetic stripes using ferromagnetic resonance.

Main Methods:

  • Utilized ferromagnetic resonance (FMR) with a microresonator setup for high-sensitivity measurements.
  • Performed quantitative analysis of dynamic and static magnetic properties of single nanomagnets (volumes of (100 nm)³).
  • Employed micromagnetic simulations to visualize the spatial distribution of spin wave modes.

Main Results:

  • Identified both uniform and non-uniform volume modes within the spin wave excitation spectrum.
  • Experimental results showed excellent agreement with micromagnetic simulations.
  • Demonstrated the capability to quantitatively analyze magnetic properties of individual nanomagnets.

Conclusions:

  • Ferromagnetic resonance is a powerful technique for characterizing magnetic properties and spin dynamics in nanomagnets.
  • The study provides crucial insights into spin relaxation processes for future spintronic device design.
  • Micromagnetic simulations effectively complement experimental findings for understanding mode distributions.