Abstract
Direction and strength effects of a magnetic field on theground-state tunnel splitting for a biaxial spin molecule with themodel Hamiltonian H = k1Sz2 + k2Sy2-gµBHzSz-gµBHySy have been investigatedwithin a continuous-spin approach including the Wess-Zumino-Berryterm. The topological oscillation and the non-Kramers freezingindicated in the approach are in agreement with those observed in arecent experiment on Fe8 molecular nanomagnets. Thebehaviour of tunnel splitting with multiple orbits induced bystrong fields has been revealed clearly.
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