Entrapment of magnetic microcrystals for on-chip electron spin resonance studies

作者：Nickolas Groll, Sylvain Bertaina, Mekhala Pati, N.S. Dalal, I. Chiorescu · 发表于：Journal of Applied Physics · 年份：2009 · DOI：10.1063/1.3207774 · 被引用次数：4 · 研究领域：Magnetism in coordination complexes、Advanced NMR Techniques and Applications、Electron Spin Resonance Studies

On-chip electron spin resonance (ESR) of magnetic molecules requires the ability to precisely position nanosized samples in antinodes of the electromagnetic field for maximal magnetic interaction. A method is developed to entrap microcrystals 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 Cr5+ spins are 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.