High sensitivity SQUID-detection and feedback-cooling of an ultrasoft microcantilever | Zendy

Andrea Vinante | Zendy; A. Kirste | Zendy; Arthur den Haan | Zendy; O. Usenko | Zendy; G. Wijts | Zendy; E. Jeffrey | Zendy; Petro Sonin | Zendy; Dirk Bouwmeester | Zendy; Tjerk H. Oosterkamp | Zendy

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High sensitivity SQUID-detection and feedback-cooling of an ultrasoft microcantilever

Author(s) -

Andrea Vinante,

A. Kirste,

Arthur den Haan,

O. Usenko,

G. Wijts,

E. Jeffrey,

Petro Sonin,

Dirk Bouwmeester,

Tjerk H. Oosterkamp

Publication year - 2012

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4752766

Subject(s) - cantilever , squid , sensitivity (control systems) , displacement (psychology) , coupling (piping) , materials science , condensed matter physics , dimensionless quantity , noise (video) , magnetometer , physics , optoelectronics , magnetic field , mechanics , electronic engineering , composite material , psychology , ecology , image (mathematics) , quantum mechanics , artificial intelligence , computer science , engineering , psychotherapist , biology

We measure the motion of an ultrasoft cantilever, carrying a ferromagnetic particle, by means of a superconducting quantum interference device (SQUID). In our scheme, the cantilever motion modulates the magnetic flux in the SQUID due to the coupling with the magnetic particle. For the cantilever fundamental mode, cooled to temperatures below 100 mK, we achieve a dimensionless coupling factor as large as 0.07, displacement sensitivity of 200 fm/Hz, and subattonewton force sensitivity. We demonstrate the outstanding combination of very low displacement and force noise by feedback-cooling the cantilever mode to an effective mode temperature of 160 μK.

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