Advances in SQUID-detected magnetic resonance force microscopy

Wit, M. de (2019)

Doctoral Thesis

In this thesis, we describe the latest advances in SQUID-detected Magnetic Resonance Force Microscopy (MRFM). We have developed a new MRFM setup, which we describe in great detail, in particular our efforts to remove vibrational noise from our dry dilution refrigerator, whilst maintaining the lowest possible operating temperatures, and our solution to reduce the crosstalk between the B1 field and SQUID (Superconducting QUantum Interference Device) detection. We have used the setup to further investigate the MRFM signals of copper nuclei, with a specific focus on the usage of higher modes of the cantilever as source for the B1 field, resulting in an MRFM frequency shift signal from the Boltzmann polarization of spins in a voxel as small as (40 nm)3. Furthermore, we have investigated the spin system in diamond, where we found evidence of the suppression of spin-diffusion in the layer of surface spins due to our high magnetic field gradients.

• MRFM
• Dilution refrigerator
• Cryogenics
• Vibration isolation
• Nano MRI
• Scanning Probe Microscopy

• All authors: Wit, M. de
• Supervisor: Oosterkamp, T.H.
• Committee: Davis, J.P.; Marohn, J.A.; Eliel, E.R.; Huber, M.I.; Ruitenbeek, J.M. van
• Qualification: Doctor (dr.)
• Awarding Institution: Leiden Institute of Physics (LION), Faculty of Science, Leiden University
• Date: 2019-06-18
• Title of host publication: Casimir PhD Series
• ISBN (print): 9789085934004
• Name: 2019-14