Abstract
An easy plane ferromagnetic nanoparticle with a magnetic field along the easy axis in the easy plane, is considered. When the applied field is reversed the system finds itself in a metastable ground state of a double well potential. Tunneling is between this state and the various states on the other, stable, side of the double well. Unlike the much studied case of Mn12, the states into which the system tunnels have energies determined by harmonic oscillations about equilibrium. Specific expressions are obtained for the tunneling matrix elements examined between the various levels and for relaxation toward the ground state. The formalism involves auxiliary particle techniques and the results are contrasted with the existing theory based upon the functional integral approach.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5630-5632 |
| Number of pages | 3 |
| Journal | Journal of Applied Physics |
| Volume | 85 |
| Issue number | 8 II B |
| State | Published - Apr 15 1999 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
Cite this
Theory of magnetic structure determination for small ferromagnets. / Preda, Mihai; Barnes, Stewart.
In: Journal of Applied Physics, Vol. 85, No. 8 II B, 15.04.1999, p. 5630-5632.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Theory of magnetic structure determination for small ferromagnets
AU - Preda, Mihai
AU - Barnes, Stewart
PY - 1999/4/15
Y1 - 1999/4/15
N2 - An easy plane ferromagnetic nanoparticle with a magnetic field along the easy axis in the easy plane, is considered. When the applied field is reversed the system finds itself in a metastable ground state of a double well potential. Tunneling is between this state and the various states on the other, stable, side of the double well. Unlike the much studied case of Mn12, the states into which the system tunnels have energies determined by harmonic oscillations about equilibrium. Specific expressions are obtained for the tunneling matrix elements examined between the various levels and for relaxation toward the ground state. The formalism involves auxiliary particle techniques and the results are contrasted with the existing theory based upon the functional integral approach.
AB - An easy plane ferromagnetic nanoparticle with a magnetic field along the easy axis in the easy plane, is considered. When the applied field is reversed the system finds itself in a metastable ground state of a double well potential. Tunneling is between this state and the various states on the other, stable, side of the double well. Unlike the much studied case of Mn12, the states into which the system tunnels have energies determined by harmonic oscillations about equilibrium. Specific expressions are obtained for the tunneling matrix elements examined between the various levels and for relaxation toward the ground state. The formalism involves auxiliary particle techniques and the results are contrasted with the existing theory based upon the functional integral approach.
UR - http://www.scopus.com/inward/record.url?scp=0003056260&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0003056260&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0003056260
VL - 85
SP - 5630
EP - 5632
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 8 II B
ER -