TY - JOUR
T1 - Consistent energy barrier distributions in magnetic particle chains
AU - Laslett, O.
AU - Ruta, S.
AU - Chantrell, R. W.
AU - Barker, J.
AU - Friedman, G.
AU - Hovorka, O.
N1 - Funding Information:
We gratefully acknowledge financial support from the EPSRC doctoral training centre grant ( EP/G03690X/1 ).
Publisher Copyright:
© 2015 Elsevier B.V.All rights reserved.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - We investigate long-time thermal activation behaviour in magnetic particle chains of variable length. Chains are modelled as Stoner-Wohlfarth particles coupled by dipolar interactions. Thermal activation is described as a hopping process over a multidimensional energy landscape using the discrete orientation model limit of the Landau-Lifshitz-Gilbert dynamics. The underlying master equation is solved by diagonalising the associated transition matrix, which allows the evaluation of distributions of time scales of intrinsic thermal activation modes and their energy representation. It is shown that as a result of the interaction dependence of these distributions, increasing the particle chain length can lead to acceleration or deceleration of the overall relaxation process depending on the initialisation procedure.
AB - We investigate long-time thermal activation behaviour in magnetic particle chains of variable length. Chains are modelled as Stoner-Wohlfarth particles coupled by dipolar interactions. Thermal activation is described as a hopping process over a multidimensional energy landscape using the discrete orientation model limit of the Landau-Lifshitz-Gilbert dynamics. The underlying master equation is solved by diagonalising the associated transition matrix, which allows the evaluation of distributions of time scales of intrinsic thermal activation modes and their energy representation. It is shown that as a result of the interaction dependence of these distributions, increasing the particle chain length can lead to acceleration or deceleration of the overall relaxation process depending on the initialisation procedure.
KW - Dipolar interaction
KW - Energy barrier distributions
KW - Magnetic particle chains
KW - Thermal relaxation
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U2 - 10.1016/j.physb.2015.09.044
DO - 10.1016/j.physb.2015.09.044
M3 - Article
AN - SCOPUS:84959420882
SN - 0921-4526
VL - 486
SP - 173
EP - 176
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -