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On-chip Electron Spin Resonance (ESR) of magnetic molecules requires theability to precisely position nanosized samples in antinodes of theelectro-magnetic field for maximal magnetic interaction. A method is developedto entrap micro-crystals containing spins in a well defined location on asubstrate's surface. Traditional cavity ESR measurements are then performed ona mesoscopic crystal at 34 GHz. Polycrystalline diluted Cr$^{5+}$ spins wereentrapped as well and measured while approaching the lower limit of the ESRsensitivity. This method suggests the feasibility of on-chip ESR measurementsat dilution refrigerator temperatures by enabling the positioning of samplesatop an on-chip superconducting cavity.

Entrapment of magnetic micro-crystals for on-chip electron spin resonance studies