The exchange coupling mentioned in Module 32-8 as being responsible for ferromagnetism is not the mutual magnetic interaction between two elementary magnetic dipoles. To show this, calculate (a) the magnitude of the magnetic field a distance of 10 nm away, along the dipole axis, from an atom with magnetic dipole moment 1.5 * 10-23 J/T (cobalt), and (b) the minimum energy required to turn a second identical dipole end for end in this field. (c) By comparing the latter with the mean translational kinetic energy of 0.040 eV, what can you conclude?
The exchange coupling mentioned in Module 32-8 as being responsible for ferromagnetism is not the mutual magnetic interaction between two elementary magnetic dipoles. To show this, calculate (a) the magnitude of the magnetic field a distance of 10 nm away, along the dipole axis, from an atom with magnetic dipole moment 1.5 * 10-23 J/T (cobalt), and (b) the minimum energy required to turn a second identical dipole end for end in this field. (c) By comparing the latter with the mean translational kinetic energy of 0.040 eV, what can you conclude?
University Physics Volume 3
17th Edition
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:William Moebs, Jeff Sanny
Chapter8: Atomic Structure
Section: Chapter Questions
Problem 49P: Show that U=B . (Hint: An infinitesimal amount of work is done to align the magnetic moment with the...
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The exchange coupling mentioned in Module 32-8 as
being responsible for ferromagnetism is not the mutual magnetic
interaction between two elementary magnetic dipoles. To show
this, calculate (a) the magnitude of the magnetic field a distance of
10 nm away, along the dipole axis, from an atom with magnetic
dipole moment 1.5 * 10-23 J/T (cobalt), and (b) the minimum
energy required to turn a second identical dipole end for end in
this field. (c) By comparing the latter with the mean translational
kinetic energy of 0.040 eV, what can you conclude?
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