Scanning Hall probe microscope

The SHPM can also image magnetic induction under applied fields up to ~1 tesla and over a wide range of temperatures (millikelvins to 300 K).

The magnetic field caused by hall probe is so minimal it has a negligible effect on sample it is measuring.

The measurement can be performed from 5 – 500 K in ultra high vacuum (UHV) and is nondestructive to the crystal lattice or structure.

The detectable magnetic field sensitivity, is approximately 0.1 uT – 10 T. SHPM can be combined with other scanning methods such as STM.

High resolution scans become difficult due to the thermal noise of extremely small hall probes.

(a) Schematic of a SHPM setup. (b) An optical image of the Hall sensor (scale bar 20 μm) and an electron micrograph of the Hall cross (scale bar 1 μm). (c) Schematic of the local heating in an Au/Ge/Pb/SiO 2 /Si multilayer by the STM tip. Superconductivity is suppressed in near a vortex. (d) SHPM image of a vortex lattice (individual vortex size ~1 μm). (e) SHPM image after applying a tunneling current and then lifting up the STM tip for Hall probe imaging. A vortex cluster forms at the tip position due to the local quenching of the hot spot. [ 1 ]
Typical atomic force microscopy set-up
Typical atomic force microscopy set-up