A promising platform to realise quantum computation uses the spin states of confined electrons to define the qubit. In order to achieve reliable control and high integration of spin qubit devices on a chip, we aim to pattern nanometer-scale magnets that large magnetic field gradients at the position of the confined electron. We fabricate highly magnetic cobalt nanostructures using focused-electron-beam-induced deposition. We characterize the magnetization properties of the nanomagnets by NV scanning microscopy, as well as magnetotransport. The scanning probe images indicate the structure of the magnetic domains and the profile of the magnetic stray fields, which can be further used as a guideline for qubit device optimisation.
University of Basel
Title of Poster
Magnetic properties of cobalt - nanomagnets: towards spin qubit control