40 citations · 84 across the 7 of their papers we have counts for
7 papers
Increased muon field at surface and substrate interface of palladium thin films
Gesa Welker, Martin de Wit, Tjerk H. Oosterkamp +4
We performed depth-dependent low-energy muon spin spectroscopy (SR) studies on three palladium 100 nm thin films, both undoped and doped with 170 ppm of iron. Muons implanted in…
Probing interacting two-level systems with rare-earth ions
Dapeng Ding, David van Driel, Lino M. C. Pereira +8
Two-level systems (TLS) in amorphous materials limit coherence times of a number of solid-state quantum devices. Interactions between TLS become prominent below 100 mK, but the cou…
Flux compensation for SQUID-detected Magnetic Resonance Force Microscopy
Martin de Wit, Gesa Welker, Frederik G. Hoekstra +1
One of the major challenges in performing SQUID-detected Magnetic Resonance Force Microscopy (MRFM) at milliKelvin temperatures is the crosstalk between the radiofrequency (RF) pul…
Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator
Martin de Wit, Gesa Welker, Kier Heeck +6
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 a…
Feasibility of imaging using Boltzmann polarization in nuclear Magnetic Resonance Force Microscopy
Martin de Wit, Gesa Welker, Jelmer Wagenaar +2
We report on Magnetic Resonance Force Microscopy measurements of the Boltzmann polarization of the nuclear spins in copper by detecting the frequency shift of a soft cantilever. We…
Density and of surface and bulk spins in diamond in high magnetic field gradients
Martin de Wit, Gesa Welker, Marc de Voogd +1
We report on surface and bulk spin density measurements of diamond, using ultra-sensitive magnetic force microscopy with magnetic field gradients up to 0.5 T/m. At temperatures…
Nested Trampoline Resonators for Optomechanics
Matthew J. Weaver, Brian Pepper, Fernando Luna +7
Two major challenges in the development of optomechanical devices are achieving a low mechanical and optical loss rate and vibration isolation from the environment. We address both…