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

Vinante, Andrea; Kirste, A.; Haan, A.M.J. den; Usenko, O.; Wijts, G.; Jeffrey, E.; Sonin, Petro; Bouwmeester, Dirk; Oosterkamp, Tjerk H.

doi:10.1063/1.4752766

Cited by 13 publications

(9 citation statements)

References 26 publications

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“…In Fig 4, we have plotted the rms displacement noise of the detection coil with respect to the MRFM setup 19 (position 4 in Fig. 1) versus the integration bandwidth after the implementation of all modifications.…”

Section: Vibration Isolation Of the Cryostatmentioning

confidence: 99%

Atomic resolution scanning tunneling microscopy in a cryogen free dilution refrigerator at 15 mK

Haan

Wijts

Galli

et al. 2014

Review of Scientific Instruments

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Pulse tube refrigerators are becoming more common, because they are cost efficient and demand less handling than conventional (wet) refrigerators. However, a downside of a pulse tube system is the vibration level at the cold-head, which is in most designs several micrometers. We implemented vibration isolation techniques which significantly reduced vibration levels at the experiment. These optimizations were necessary for the vibration sensitive magnetic resonance force microscopy experiments at milli-kelvin temperatures for which the cryostat is intended. With these modifications we show atomic resolution scanning tunneling microscopy on graphite. This is promising for scanning probe microscopy applications at very low temperatures.

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Section: Vibration Isolation Of the Cryostatmentioning

confidence: 99%

Atomic resolution scanning tunneling microscopy in a cryogen free dilution refrigerator at 15 mK

Haan

Wijts

Galli

et al. 2014

Review of Scientific Instruments

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“…The vibration isolation presented here is intended to be used for a low temperature MFM/MRFM setup, where an ultrasoft resonator is used to measure the properties of various spin systems 17 . Due to the low stiffness and high quality factor of the resonator the system is extremely sensitive to small forces 18 , but also to vibrations. Therefore, we will demonstrate the effectiveness of the vibration isolation by analyzing the displacement noise spectrum and thermal properties of the resonator, showing that our vibration isolation allows us to perform highly sensitive measurements in a cryogen-free dilution refrigerator.…”

Section: Introductionmentioning

confidence: 99%

Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator

Wit

Welker

Heeck

et al. 2019

Review of Scientific Instruments

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We present the design and implementation of a mechanical low-pass filter vibration isolation used to reduce the vibrational noise in a cryogen-free dilution refrigerator operated at 10 mK, intended for scanning probe techniques. We discuss the design guidelines necessary to meet the competing requirements of having a low mechanical stiffness in combination with a high thermal conductance. We demonstrate the effectiveness of our approach by measuring the vibrational noise levels of an ultrasoft mechanical resonator positioned above a SQUID. Starting from a cryostat base temperature of 8 mK, the vibration isolation can be cooled to 10.5 mK, with a cooling power of 113 µW at 100 mK. We use the low vibrations and low temperature to demonstrate an effective cantilever temperature of less than 20 mK. This results in a force sensitivity of less than 500 zN/ √ Hz, and an integrated frequency noise as low as 0.4 mHz in a 1 Hz measurement bandwidth.

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“…With the flux noise S 1/2 = 220 n 0 / √ Hz, this yields an extremely low value for the predicted displacement sensitivity S 1/2 r = S 1/2 / y = 110 fm/ √ Hz, which is already a factor of 2 below the best value found in the literature. [51][52][53] Still, S r is by far not optimized and could be further improved by using a reduced linewidth for the SQUID arm in the top Nb layer and by increasing the number of spins in the magnet.…”

Section: Displacement Detectionmentioning

confidence: 99%

Nanoscale multifunctional sensor formed by a Ni nanotube and a scanning Nb nanoSQUID

et al. 2013

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Nanoscale magnets might form the building blocks of next generation memories. To explore their functionality, magnetic sensing at the nanoscale is key. We present a multifunctional combination of a nanometer-sized superconducting quantum interference device (nanoSQUID) and a Ni nanotube attached to an ultrasoft cantilever as a magnetic tip. By scanning the Nb nanoSQUID with respect to the Ni tube, we map out and analyze their magnetic coupling, demonstrate the imaging of an Abrikosov vortex trapped in the SQUID structure -which is important in ruling out spurious magnetic signals -and reveal the high potential of the nanoSQUID as an ultrasensitive displacement detector. Our results open a new avenue for fundamental studies of nanoscale magnetism and superconductivity.

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

Cited by 13 publications

References 26 publications

Atomic resolution scanning tunneling microscopy in a cryogen free dilution refrigerator at 15 mK

Atomic resolution scanning tunneling microscopy in a cryogen free dilution refrigerator at 15 mK

Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator

Nanoscale multifunctional sensor formed by a Ni nanotube and a scanning Nb nanoSQUID

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