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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
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: 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...
Paramagnetism01:30

Paramagnetism

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...
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 14, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Turning on single-molecule magnet behavior in a linear {Mn3} compound.

Fatemah Habib1, Gabriel Brunet, Francis Loiseau

  • 1Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, Canada K1N6N5.

Inorganic Chemistry
|January 25, 2013
PubMed
Summary

A new manganese compound with a linear {Mn(3)} core was synthesized. This compound exhibits single-molecule magnet behavior due to structural anisotropy, unlike its precursor.

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Last Updated: May 14, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetism

Background:

  • Manganese compounds with mixed-valent cores are of interest for their magnetic properties.
  • Previous work established a linear {Mn(3)} complex, [Mn(IV)(3)(dpo)(6)]·2MeCN.

Purpose of the Study:

  • To synthesize and characterize a new mixed-valent manganese compound with a linear {Mn(3)} core.
  • To investigate the structural and magnetic properties of the new compound and compare it to a known analog.

Main Methods:

  • Synthesis of compound 2, Na[Mn(IV)(2)Mn(III)(Hoxol)(6)](n)·MeOH·H(2)O, using Mn(OAc)(2)·4H(2)O, H(3)oxol, and NaOH.
  • Structural analysis of the resulting coordination polymer.
  • Magnetic susceptibility measurements from 1.9-300 K.

Main Results:

  • Isolation of compound 2 with a linear Mn(IV)-Mn(III)-Mn(IV) core and a central Mn(III) ion.
  • The structure forms a one-dimensional coordination polymer linked by Na(+) ions.
  • Compound 2 exhibits single-molecule magnet (SMM) behavior, attributed to Jahn-Teller distortions on Mn(III) ions.

Conclusions:

  • The synthesized compound 2 displays single-molecule magnet properties, a significant finding for manganese-based SMMs.
  • Structural anisotropy, particularly Jahn-Teller distortions, is crucial for inducing SMM behavior in this system.
  • Weak antiferromagnetic interactions along the chains modulate the SMM properties.