  A novel method for simultaneous detection of both DC and time-dependent
magnetic signatures in individual mesoscopic structures has emerged from early
studies in spin mechanics. Multifrequency nanomechanical detection of AC
susceptibility and its harmonics highlights reversible nonlinearities in the
magnetization response of a single yttrium iron garnet (YIG) element,
separating them from hysteretic jumps in the DC magnetization.
