Scanning NV magnetometry of focused-electron-beam-deposited cobalt nanomagnets

• URL: http://arxiv.org/abs/2306.06650v2
• Date: Fri, 23 Jun 2023 11:50:13 GMT
• Title: Scanning NV magnetometry of focused-electron-beam-deposited cobalt nanomagnets
• Authors: Liza \v{Z}aper, Peter Rickhaus, Marcus Wyss, Boris Gross, Martino Poggio, and Floris Braakman
• Abstract summary: Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets for spin qubit control in a single step. We fabricate cobalt nanomagnets in such a process, obtaining cobalt contents and saturation magnetizations comparable to or higher than those typically obtained using electron-beam lithography.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets for spin qubit control in a single step. We fabricate cobalt nanomagnets in such a process, obtaining cobalt contents and saturation magnetizations comparable to or higher than those typically obtained using electron-beam lithography. We characterize the nanomagnets using transmission electron microscopy and image their stray magnetic field using scanning NV magnetometry, finding good agreement with micromagnetic simulations. The magnetometry reveals the presence of magnetic domains and halo side-deposits, which are common for this fabrication technique. Finally, we estimate dephasing times for electron spin qubits in the presence of disordered stray fields due to these side-deposits.

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