Intermediate Spin, Schrödinger Cat States, and Nanomagnets

Quantum tunneling in nanomagnets finds a natural description in terms of intermediate spin. Periodic magnetic effects correspond to a change of flux by the flux quantum ${\Phi }_0$. Schrödinger cat states with different superpositions of the applied magnetic field occur. The molecular magnet ${\mathrm{Fe}}_8$ is discussed and new effects are predicted for ${\mathrm{Mn}}_{12}$.