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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.
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 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...
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.

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Related Experiment Video

Updated: May 12, 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

Spin-polarized transport through single-molecule magnet Mn6 complexes.

Eduard Cremades1, C D Pemmaraju, Stefano Sanvito

  • 1Departament de Química Inorgànica and Centre de Recerca en Química Teòrica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain.

Nanoscale
|April 20, 2013
PubMed
Summary

This study explores Mn6 single-molecule magnets for spintronic devices. The S=12 spin state exhibits significantly higher current and spin polarization, making it ideal for spin-switches and spin-valves.

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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

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Last Updated: May 12, 2026

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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:

  • Molecular Magnetism
  • Spintronics
  • Quantum Transport

Background:

  • Single-molecule magnets (SMMs) offer potential for nanoscale electronic devices.
  • Controlling spin states in molecular systems is crucial for spintronic applications.

Purpose of the Study:

  • To theoretically investigate the coherent transport properties of a Mn6 single-molecule magnet sandwiched between gold electrodes.
  • To compare the electrical transport behavior of different spin states (S=12 and S=4) in the Mn6 molecule.

Main Methods:

  • Utilizing the non-equilibrium Green's function (NEGF) approach.
  • Combining NEGF with density functional theory (DFT) for accurate electronic structure calculations.

Main Results:

  • The S=12 ground state of the Mn6 molecule shows a current one order of magnitude higher than the S=4 state for voltages up to 1V.
  • The current in the S=12 state is almost completely spin-polarized due to the nature of its frontier molecular orbitals.
  • The Mn6 molecule exhibits high magnetic anisotropy.

Conclusions:

  • The high-anisotropy Mn6 molecule is a promising candidate for single-molecule spintronic devices.
  • It can be utilized for implementing spin-switches and low-temperature spin-valves at the molecular level.