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

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

2009-08-21

arxiv.org/abs/0908.3038v1

J. Appl. Phys., 106 (4), 046106 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Journal of Applied Physics

Scientific paper

10.1063/1.3207774

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

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