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We study spin tunneling in a magnetic nanoparticle with biaxial anisotropy that is free to rotate about its anisotropy axis. Equations of motion are derived that couple spin and mechanical degrees of freedom and the exact instanton of these equations is obtained. We show that mechanical freedom of the particle renormalizes magnetic anisotropy and increases the tunnel splitting.
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O’Keeffe et al. (2011) studied this question.
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