In a magnetic material, the energy of the exchange interaction between neighboring atoms is about 1 eV/atom,
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In a magnetic material, the energy of the exchange interaction between neighboring atoms is about 1 eV/atom, whereas the magnetic dipolar interaction between neighbouring assemblies of atoms has an average value of 10 −5 eV/atom. Use this data to estimate the maximum size of a spherical single domain particle. ( Hint : Assume that the exchange interaction only operates between atomic neighbors, whereas in a small particle the dipolar interaction affects all atoms equally. In addition, for an estimate, assume that the atoms are cubes with a width of 0.2 nm).
Related Book For
Biochemistry Concepts and Connections
ISBN: 978-0321839923
1st edition
Authors: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
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