Magnetic relaxation in finite two-dimensional nanoparticle ensembles

Details Magnetic relaxation in finite two-dimensional nanoparticle ensembles Magnetic relaxation in finite two-dimensional nanoparticle ensembles

2003-05-15

arxiv.org/abs/cond-mat/0305343v1

PHYSICAL REVIEW B 67, 014411 (2003)

Physics

Condensed Matter

21 pages, 4 figures

Scientific paper

10.1103/PhysRevB.67.014411

We study the slow phase of thermally activated magnetic relaxation in finite two-dimensional ensembles of dipolar interacting ferromagnetic nanoparticles whose easy axes of magnetization are perpendicular to the distribution plane. We develop a method to numerically simulate the magnetic relaxation for the case that the smallest heights of the potential barriers between the equilibrium directions of the nanoparticle magnetic moments are much larger than the thermal energy. Within this framework, we analyze in detail the role that the correlations of the nanoparticle magnetic moments and the finite size of the nanoparticle ensemble play in magnetic relaxation.

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