  The Ground-state criticality of many-body systems is a resource for
quantum-enhanced sensing, namely the Heisenberg precision limit, provided that
one has access to the whole system. We show that for partial accessibility, the
sensing capabilities of a block of spins in the ground state reduces to the
sub-Heisenberg limit. To compensate for this, we drive the hamiltonian
periodically and use a local steady-state for quantum sensing. Remarkably, the
steady-state sensing shows a significant enhancement in precision compared to
the ground state and even achieves super-Heisenberg scaling for low
frequencies. The origin of this precision enhancement is related to the closing
of the Floquet quasienergy gap. It is in close correspondence with the
vanishing of the energy gap at criticality for ground state sensing with global
accessibility. The proposal is general to all the integrable models and can be
implemented on existing quantum devices.
