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We study the temperature dependence of the fluctuation of the switching field of small magnetic structures. For samples of different thicknesses, the fluctuations exhibit opposite temperature dependences. At the same time the switching field decreases linearly with temperature for both samples. Simulation shows that the mechanism of switching is different between the samples. We perform analytic calculations based on models suggested by the simulation and found temperature dependences in agreement with the experimental results.
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Wang et al. (2004) studied this question.
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