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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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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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Paramagnetism01:30

Paramagnetism

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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...
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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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...
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Ferromagnetism01:31

Ferromagnetism

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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...
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Valence Bond Theory02:42

Valence Bond Theory

11.9K
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...
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Updated: Apr 16, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

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3d single-ion magnets.

Gavin A Craig1, Mark Murrie

  • 1WestCHEM, School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK. mark.murrie@glasgow.ac.uk.

Chemical Society Reviews
|February 27, 2015
PubMed
Summary
This summary is machine-generated.

Single-molecule magnets (SMMs) are crucial for data storage. Optimizing the ligand field around single 3d transition metal ions enhances magnetic anisotropy, leading to higher energy barriers for SMMs.

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Single-molecule magnets (SMMs) are key for future data storage technologies.
  • The barrier to magnetization reversal (Ueff) determines SMM performance.
  • Ueff is influenced by magnetic anisotropy and spin ground state size.

Purpose of the Study:

  • To explore maximizing magnetic anisotropy in single 3d transition metal ions.
  • To investigate the role of ligand fields in enhancing anisotropy.
  • To advance the development of single-ion magnets (SIMs).

Main Methods:

  • Designing ligands to control 3d orbital splitting.
  • Selecting appropriate 3d transition metal ions.
  • Synthesizing and characterizing single-ion magnet complexes.

Main Results:

  • Demonstrated the importance of ligand design in tuning magnetic properties.
  • Showcased the potential of various first-row transition metal ions in SIMs.
  • Explored diverse coordination environments for paramagnetic ions.

Conclusions:

  • Ligand field engineering is critical for developing high-performance SIMs.
  • Synthetic chemists play a vital role in advancing SMM technology.
  • Continued research on 3d-based SIMs promises significant advancements in data storage.