NanoSQUID-on-tip: Towards scanning magnetic microscopy with single spin sensitivity |
| TYPE | Condensed Matter Seminar |
| Speaker: | Eli Zeldov |
| Affiliation: | WIS |
| Date: | 21.01.2014 |
| Time: | 14:30 |
| Location: | Lidow Nathan Rosen (300) |
| Abstract: | A scanning magnetic probe microscope based on a nanoSQUID residing on the apex of a quartz tip has been developed. The nanoSQUID-on-tip device is fabricated by pulling a quartz tube into a sharp pipette with diameters down to 50 nm followed by deposition of a thin superconducting film onto the sides and the apex of the pipette. The devices operate at 4 K in applied magnetic fields of up to 1 T and display an extremely low flux noise of 50 nΦ_0/Hz^1/2 As a result, a record spin sensitivity of 0.4 μ_B/Hz^1/2 is achieved that is sufficient for detecting the magnetic moment of a single electron [1]. Using an AFM based technique the nanoSQUID can be scanned few nm above the surface of the sample. The combination of high sensitivity, high spatial resolution, wide bandwidth, and close proximity to the sample opens the pathway to direct imaging and investigation of a wide range of static and dynamic magnetic phenomena on the nanoscale. Preliminary results of study of vortex dynamics in superconductors will be presented. [1] D. Vasyukov, Y. Anahory, L. Embon, D. Halbertal, J. Cuppens, L. Neeman, A. Finkler, Y. Segev, Y. Myasoedov, M. L. Rappaport, M. E. Huber, and E. Zeldov, Nature Nanotech. 8, 639 (2013). |