Theory of magnetic structure determination for small ferromagnets

Mihai Preda; Stewart E. Barnes

doi:10.1063/1.369821

Theory of magnetic structure determination for small ferromagnets

Mihai Preda, Stewart E. Barnes

Physics

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

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
DOIs	https://doi.org/10.1063/1.369821
State	Published - Apr 15 1999
Event	Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States Duration: Nov 9 1998 → Nov 12 1998

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.369821

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title = "Theory of magnetic structure determination for small ferromagnets",

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.",

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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.

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