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Title: Low-temperature magnetization dynamics of magnetic molecular solids in a swept field

Abstract

The swept-field experiments on magnetic molecular solids such as Fe{sub 8} are studied using Monte Carlo simulations, and a kinetic equation developed to understand collective magnetization phenomena in such solids, where the collective aspects arise from dipole–dipole interactions between different molecules. Because of these interactions, the classic Landau–Zener–Stückelberg theory proves inadequate, as does another widely used model constructed by Kayanuma. It is found that the simulations provide a quantitatively accurate account of the experiments. The kinetic equation provides a similarly accurate account except at very low sweep velocities, where it fails modestly. This failure is attributed to the neglect of short-range correlations between the dipolar magnetic fields seen by the molecular spins. The simulations and the kinetic equation both provide a good understanding of the distribution of these dipolar fields, although analytic expressions for the final magnetization remain elusive.

Authors:
; ;
Publication Date:
OSTI Identifier:
22451162
Resource Type:
Journal Article
Journal Name:
Annals of Physics
Additional Journal Information:
Journal Volume: 356; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-4916
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; DIPOLES; IRON; KINETIC EQUATIONS; MAGNETIC FIELDS; MAGNETIZATION; MOLECULES; MONTE CARLO METHOD; SOLIDS

Citation Formats

Lenferink, Erik, Vijayaraghavan, Avinash, and Garg, Anupam, E-mail: agarg@northwestern.edu. Low-temperature magnetization dynamics of magnetic molecular solids in a swept field. United States: N. p., 2015. Web. doi:10.1016/J.AOP.2015.02.006.
Lenferink, Erik, Vijayaraghavan, Avinash, & Garg, Anupam, E-mail: agarg@northwestern.edu. Low-temperature magnetization dynamics of magnetic molecular solids in a swept field. United States. doi:10.1016/J.AOP.2015.02.006.
Lenferink, Erik, Vijayaraghavan, Avinash, and Garg, Anupam, E-mail: agarg@northwestern.edu. Fri . "Low-temperature magnetization dynamics of magnetic molecular solids in a swept field". United States. doi:10.1016/J.AOP.2015.02.006.
@article{osti_22451162,
title = {Low-temperature magnetization dynamics of magnetic molecular solids in a swept field},
author = {Lenferink, Erik and Vijayaraghavan, Avinash and Garg, Anupam, E-mail: agarg@northwestern.edu},
abstractNote = {The swept-field experiments on magnetic molecular solids such as Fe{sub 8} are studied using Monte Carlo simulations, and a kinetic equation developed to understand collective magnetization phenomena in such solids, where the collective aspects arise from dipole–dipole interactions between different molecules. Because of these interactions, the classic Landau–Zener–Stückelberg theory proves inadequate, as does another widely used model constructed by Kayanuma. It is found that the simulations provide a quantitatively accurate account of the experiments. The kinetic equation provides a similarly accurate account except at very low sweep velocities, where it fails modestly. This failure is attributed to the neglect of short-range correlations between the dipolar magnetic fields seen by the molecular spins. The simulations and the kinetic equation both provide a good understanding of the distribution of these dipolar fields, although analytic expressions for the final magnetization remain elusive.},
doi = {10.1016/J.AOP.2015.02.006},
journal = {Annals of Physics},
issn = {0003-4916},
number = ,
volume = 356,
place = {United States},
year = {2015},
month = {5}
}