  The nitrogen vacancy (NV) center in diamond is an increasingly popular
quantum sensor for microscopy of electrical current, magnetization, and spins.
However, efficient NV-sample integration with a robust, high-quality interface
remains an outstanding challenge to realize scalable, high-throughput
microscopy. In this work, we characterize a diamond micro-chip (DMC) containing
a (111)-oriented NV ensemble; and demonstrate its utility for high-resolution
quantum microscopy. We perform strain imaging of the DMC and find minimal
detrimental strain variation across a field-of-view of tens of micrometer. We
find good ensemble NV spin coherence and optical properties in the DMC,
suitable for sensitive magnetometry. We then use the DMC to demonstrate
wide-field microscopy of electrical current, and show that diffraction-limited
quantum microscopy can be achieved. We also demonstrate the deterministic
transfer of DMCs with multiple materials of interest for next-generation
electronics and spintronics. Lastly, we develop a polymer-based technique for
DMC placement. This work establishes the DMC's potential to expand the
application of NV quantum microscopy in materials, device, geological,
biomedical, and chemical sciences.
