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Related Concept Videos

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.
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...
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.
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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...
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...

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

Lessons learned from dinuclear lanthanide nano-magnets.

Fatemah Habib1, Muralee Murugesu

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

Chemical Society Reviews
|January 22, 2013
PubMed
Summary

Researchers are exploring dinuclear lanthanide complexes to create advanced magnetic materials for high-density data storage. Understanding magnetic interactions in these systems is key to developing functional Single-Molecule Magnets (SMMs).

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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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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

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:

  • Coordination Chemistry
  • Materials Science
  • Magnetism

Background:

  • Single-Molecule Magnets (SMMs) are investigated for high-density information storage applications.
  • Mononuclear lanthanide complexes offer high energy barriers but are limited by single-ion behavior.
  • Higher nuclearity systems are explored to enhance spin states and magnetic properties.

Purpose of the Study:

  • To review dinuclear 4f complexes critical for understanding lanthanide magnetic interactions.
  • To analyze the role of various bridging ligands in mediating magnetic exchange.
  • To identify effective superexchange pathways for efficient intracomplex magnetic interactions.

Main Methods:

  • Review of existing literature on dinuclear lanthanide complexes.
  • Analysis of magnetic properties influenced by bridging moieties (oxygen-based, radical-based).
  • Evaluation of superexchange pathways for magnetic coupling.

Main Results:

  • Dinuclear complexes serve as crucial models for studying metal-metal magnetic interactions.
  • Bridging ligands significantly influence the magnetic behavior and energy barriers.
  • Specific superexchange pathways are identified as more effective for magnetic coupling.

Conclusions:

  • Dinuclear lanthanide complexes are vital for advancing SMMs for data storage.
  • Understanding magnetic interactions via bridging ligands is key to designing superior SMMs.
  • Optimizing superexchange pathways is essential for efficient intracomplex magnetic communication.