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

N S Groll (1, 2) , Sylvain Bertaina (3) , M S Pati (4) , N S Dalal (4) , I S Chiorescu (2)

1 Department of Physics [Tallahassee]
2 NHMFL - National High Magnetic Field Laboratory
3 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
4 Department of Chemistry and Biochemistry

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 Cr 5+ 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.

Domaines: Autre [cond-mat.other]; Science des matériaux [cond-mat.mtrl-sci]; Matière Condensée [cond-mat]

N S Groll, Sylvain Bertaina, M S Pati, N S Dalal, I S Chiorescu. Entrapment of magnetic microcrystals for on-chip electron spin resonance studies. Journal of Applied Physics, 2009, 106 (4), pp.046106. ⟨10.1063/1.3207774⟩. ⟨hal-00421121⟩