08,April Wednesday, at 15:30
Ahmet Oral , Sabanci University
A novel method to measure 3 components of magnetic fields with submicron resolution using Scanning Hall Probe Microscopy/Gradiometry

We present the development of a new 4-lead hall gradiometer and a novel method to measure 3 components( Bx, By & Bz) of magnetic fields on specimen surfaces with submicron resolution using Scanning Hall probe Microscope [1] and gradiometer. We used a 1┬Ám size P-HEMT Hall sensor, operated in gradiometer configuration to image Bx, By and Bz distribution of a hard disk sample surface at 77K. The SHPM was used in Quartz Crystal AFM tracking mode [2]. This simple and quick novel method shows ~40x better spatial resolution compared to previously developed techniques [3] and can be improved even further, down to sub 50nm resolution.