Scanning SQUID on tip microscopy of vortex matter

NanoSQUIDs residing on the apex of a quartz tip SOT suitable for scanning probe microscopy with record size spin sensitivity and operating magnetic fields are presented 1 We have developed SOT made of Pb with an effective diameter of 46 nm and flux noise of N amp n 50 nN amp 0 Hz1 2 at 4 2 K that is operational up to unprecedented high fields of 1 T 2 The corresponding spin sensitivity of the device is Sn 0 38 N