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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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 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...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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Related Experiment Video

Updated: Jun 14, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Size-dependent spin structures in iron nanoparticles.

A Fraile Rodríguez1, A Kleibert, J Bansmann

  • 1Paul Scherrer Institut, Villigen PSI, CH-5232 Switzerland. arantxa.fraile-rodriguez@psi.ch

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Magnetization in iron nanoparticles on cobalt shows size-dependent alignment. Smaller particles align parallel, while larger ones exhibit noncollinear spin structures due to magnetic anisotropy.

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

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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
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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

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Understanding magnetic interactions in nanoscale systems is crucial for developing advanced magnetic storage and spintronic devices.
  • The coupling between ferromagnetic nanoparticles and substrates influences their magnetic properties and spin orientation.

Purpose of the Study:

  • To investigate the magnetization orientation in individual iron nanoparticles (5-25 nm) supported on a ferromagnetic cobalt substrate.
  • To determine the critical particle size at which magnetization alignment transitions from parallel to noncollinear.
  • To elucidate the role of magnetic anisotropy in dictating the magnetic structure of these nanoparticles.

Main Methods:

  • Utilized photoemission electron microscopy (PEEM) to directly visualize and study the magnetization orientation.
  • Fabricated and analyzed single iron nanoparticles with varying sizes (5-25 nm) on a cobalt support.
  • Performed numerical calculations to model the magnetic behavior and understand the underlying physics.

Main Results:

  • Observed a parallel alignment of magnetization between iron nanoparticles and the cobalt substrate for particle sizes below approximately 6 nm.
  • Found a transition to a noncollinear alignment for particle sizes above approximately 6 nm.
  • Numerical calculations indicated a shift from an exchange-dominated regime (smaller particles, single-domain collinear state) to an anisotropy-dominated regime (larger particles, spin-spiral magnetic structure) with increasing particle height.

Conclusions:

  • The magnetic coupling and resulting magnetization orientation in iron nanoparticles on cobalt are strongly dependent on particle size.
  • Magnetic anisotropy energy plays a critical role in determining the spin-spiral magnetic structure in larger iron nanoparticles.
  • These findings provide fundamental insights into the magnetism of nanostructures with implications for future magnetic technologies.