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Magnetic Exchange in Oxides

  • Gerald F. DionneEmail author
Chapter
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Abstract

In the previous chapter, quenching of cation orbital angular momentum by the anion charges and the origin of the energy stabilization by covalent bonding was introduced by elementary crystal field and molecular orbital theory. In magnetically dilute compounds, the isolated 3d n ions are influenced next by the weakened spin-orbit coupling perturbations and multiplet structures that determine the magnetoelastic properties to be examined in  Chap. 5. These effects are initially local but can become cooperative when concentrations increase to levels where percolation can occur, e.g., a cooperative Jahn-Teller effect. However, because the spin alone is the agent of magnetic ordering in this series, the multiplet energies can be largely ignored in the discussion of spontaneous magnetism. Consequently, the next important effective field in a ligand lattice to be addressed is the magnetic exchange field that arises from the transfer integral linking magnetic cations. Magnetic exchange, therefore, is the term used to describe the energy stabilization gained from spin ordering (parallel or antiparallel) of atoms or ions covalently coupled in an ionic crystal lattice.

Keywords

Stabilization Energy Orbital State Direct Exchange Spin Alignment Superexchange Interaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Massachusetts Institute of TechnologyLexingtonUSA

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