A new experimental procedure for characterizing quantum effects in small magnetic particle systems
R. Sappey (1), E. Vincent (1), M. Ocio (1), J. Hammann (1), F. Chaput, (2), J.P. Boilot (2), D. Zins (3) ((1) SPEC CEA Saclay, (2) PMC Ecole, Polytechnique, (3) Physico-Chimie UPMC)
TL;DR
This paper introduces a novel experimental method to distinguish quantum effects from thermal behavior in small magnetic particles, demonstrated through magnetization relaxation data on nanoparticles at very low temperatures.
Contribution
The paper presents a new experimental procedure that isolates quantum effects in small magnetic particles independently of energy barrier distribution.
Findings
Clear departure from thermal dynamics observed in nanoparticle data
New procedure effectively separates quantum from thermal behavior
Experimental results align with numerical quantum models
Abstract
A new experimental procedure is discussed, which aims at separating thermal from quantum behavior independently of the energy barrier distribution in small particle systems. Magnetization relaxation data measured between 60 mK and 5 K on a sample of nanoparticles is presented. The comparison between experimental data and numerical calculations shows a clear departure from thermal dynamics for our sample, which was not obvious without using the new procedure presented here.
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