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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...
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...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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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.
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Related Experiment Video

Updated: May 18, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Dual antiferromagnetic coupling at La0.67Sr0.33MnO3/SrRuO3 interfaces.

A Solignac1, R Guerrero, P Gogol

  • 1DSM/IRAMIS/SPEC-URA 2464, CEA Saclay, F-91191 Gif sur Yvette Cedex, France. aurelie.solignac@cea.fr

Physical Review Letters
|October 4, 2012
PubMed
Summary

We studied magnetic bilayers of La0.67Sr0.33MnO3/SrRuO3 and found unusual asymmetry in magnetic reversal. This asymmetry arises from varying antiferromagnetic coupling strengths at the interface, revealed by magnetometry and neutron reflectometry.

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • La0.67Sr0.33MnO3 and SrRuO3 are complex oxide materials with significant magnetic properties.
  • Antiferromagnetically coupled bilayers are crucial for spintronic devices, but their interfacial coupling mechanisms require detailed study.

Purpose of the Study:

  • To investigate the magnetic hysteresis and reversal behavior of La0.67Sr0.33MnO3/SrRuO3 bilayers.
  • To understand the origin of the observed asymmetry in the magnetic reversal process.

Main Methods:

  • Magnetometry techniques were employed to measure magnetic properties.
  • Polarized neutron reflectometry was used to probe interfacial magnetism.
  • An extended Stoner-Wohlfarth model was applied to analyze magnetic anisotropy and coupling.

Main Results:

  • A positive exchange bias and unusual asymmetry were observed during the magnetic reversal of the La0.67Sr0.33MnO3 layer.
  • Experimental evidence suggests the asymmetry originates from two distinct antiferromagnetic coupling strengths at the interface.
  • The magnetic anisotropy of both La0.67Sr0.33MnO3 and SrRuO3 layers was considered in the analysis.

Conclusions:

  • The study provides experimental evidence for dual antiferromagnetic coupling strengths at the interface of La0.67Sr0.33MnO3/SrRuO3 bilayers.
  • This dual coupling is identified as the source of the observed asymmetry in magnetic reversal.
  • Further investigation into the origin of this dual interfacial coupling is warranted.