Figure 4.

(a) Dependence of magnetic induction perpendicular to sample surface at a fixed working distance of 5.12 mm vs. change of focal length of immersion lens (left). Dependence of the magnetic induction for lateral movement at fixed working distance, as indicated, and for fixed focal length (right). (b) In situ measured Hall voltage of Co-Fe/Pt GFM Hall cross vs. current. Data taken at room temperature. (c) Change of longitudinal resistance $R_{xx}$ vs. time during post-growth electron irradiation of GFM sample at 1.6 nA and 5 keV. (d) Comparison of Hall voltage vs. magnetic field measured ex situ for optimized GFM Hall sensor and pure Co-Fe deposit at temperature and current as indicated.