Spin-Wave-Assisted Thermal Reversal of Epitaxial Perpendicular Magnetic Nanodots

Abstract

The magnetic susceptibility of self-organized two-dimensional Co nanodots on Au(111) has been measured as a function of their size in the 2-7~nm diameter range. We show that the activation energy for the thermal reversal displays a power law behavior with the dot volume. Atomic scale simulations based on the Heisenberg hamiltonian show that this behavior is due to a deviation from the macrospin model for dot size as small as 3~nm in diameter. This discrepancy is attributed to finite temperature effects through the thermal excitation of spin-wave modes inside the particles

arXiv comment4 pages, 4 figures

References in corpus (1)

• Magnetization reversal and nonexponential relaxation via instabilities of internal spin waves in nanomagnets

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