  Using dynamic cantilever magnetometry, we study the vortex lattice and its
corresponding melting transition in a micrometer-size crystallite of
superconducting NbSe2. Measurements of the cantilever resonance frequency as a
function of magnetic field and temperature respond to the magnetization of the
vortex-lattice. The cantilever dissipation depends on thermally activated
vortex creep motion, whose pinning energy barrier is found to be in good
agreement with transport measurements on bulk samples. This approach reveals
the phase diagram of the crystallite, and is applicable to other micro- or
nanometer-scale superconducting samples.
