Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit
Summary :
A combined theory of the micromagnetic and Monte Carlo simulations is established to analyze the thermal property of a nano-sized magnetic grain. The Langevin equation of a grain's magnetic moment is the Landau-Lifshitz equation augmented by a "random-field" term representing the thermal-agitated force. The angular distribution of the magnetic moment of the grain is studied via its time evolution process. The switching of the magnetic moment vector between two energy-minimum states is observed. A simple analytical expression is obtained for the simulated attempt frequency f0, which is related to the magnetic constant of the nano-grain, and agrees well with the phenomenological value.
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- IEICE TRANSACTIONS on Electronics Vol.E86-C No.9 pp.1825-1829
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- 2003/09/01
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- Special Section PAPER (Special Issue on Recent Progress of High-Density Disk Storage)
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Jian QIN, Dan WEI, "Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit" in IEICE TRANSACTIONS on Electronics,
vol. E86-C, no. 9, pp. 1825-1829, September 2003, doi: .
Abstract: A combined theory of the micromagnetic and Monte Carlo simulations is established to analyze the thermal property of a nano-sized magnetic grain. The Langevin equation of a grain's magnetic moment is the Landau-Lifshitz equation augmented by a "random-field" term representing the thermal-agitated force. The angular distribution of the magnetic moment of the grain is studied via its time evolution process. The switching of the magnetic moment vector between two energy-minimum states is observed. A simple analytical expression is obtained for the simulated attempt frequency f0, which is related to the magnetic constant of the nano-grain, and agrees well with the phenomenological value.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e86-c_9_1825/_p
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@ARTICLE{e86-c_9_1825,
author={Jian QIN, Dan WEI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit},
year={2003},
volume={E86-C},
number={9},
pages={1825-1829},
abstract={A combined theory of the micromagnetic and Monte Carlo simulations is established to analyze the thermal property of a nano-sized magnetic grain. The Langevin equation of a grain's magnetic moment is the Landau-Lifshitz equation augmented by a "random-field" term representing the thermal-agitated force. The angular distribution of the magnetic moment of the grain is studied via its time evolution process. The switching of the magnetic moment vector between two energy-minimum states is observed. A simple analytical expression is obtained for the simulated attempt frequency f0, which is related to the magnetic constant of the nano-grain, and agrees well with the phenomenological value.},
keywords={},
doi={},
ISSN={},
month={September},}
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TY - JOUR
TI - Thermodynamic Behavior of a Nano-Sized Magnetic Grain near the Superparamagnetic Limit
T2 - IEICE TRANSACTIONS on Electronics
SP - 1825
EP - 1829
AU - Jian QIN
AU - Dan WEI
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E86-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 2003
AB - A combined theory of the micromagnetic and Monte Carlo simulations is established to analyze the thermal property of a nano-sized magnetic grain. The Langevin equation of a grain's magnetic moment is the Landau-Lifshitz equation augmented by a "random-field" term representing the thermal-agitated force. The angular distribution of the magnetic moment of the grain is studied via its time evolution process. The switching of the magnetic moment vector between two energy-minimum states is observed. A simple analytical expression is obtained for the simulated attempt frequency f0, which is related to the magnetic constant of the nano-grain, and agrees well with the phenomenological value.
ER -
English
