Quantum interference oscillations of the superparamagnetic blocking in an Fe8 molecular nanomagnet

Abstract

We show that the dynamic magnetic susceptibility and the superparamagnetic blocking temperature of an Fe8 single molecule magnet oscillate as a function of the magnetic field Hx applied along its hard magnetic axis. These oscillations are associated with quantum interferences, tuned by Hx, between different spin tunneling paths linking two excited magnetic states. The oscillation period is determined by the quantum mixing between the ground S=10 and excited multiplets. These experiments enable us to quantify such mixing. We find that the weight of excited multiplets in the magnetic ground state of Fe8 amounts to approximately 11.6%.

Accepted in Phys. Rev. Lett

References in corpus (7)

• Magnetic dispersion and anisotropy in multiferroic BiFeO3
• S-mixing and quantum tunneling of the magnetization in molecular nanomagnets
• Influence of the Dzyaloshinskii-Moriya exchange interaction on quantum phase interference of spins
• Role of Antisymmetric Exchange in Selecting Magnetic Chirality in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
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• Tunneling and inversion symmetry in single-molecule magnets: the case of the Mn12 wheel molecule
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