3.3 Results

A sample plot of channeltron currents $I_{ci}$, against electron gun beam current $I_b$, for each of the opposite magnetization directions used is given in figure 3.5, with the best fit lines whose gradients were used to represent the electron arrival rates $R_{ij}$ (equation 2.4.) The change, on magnetization reversal, in the difference between the gradients for the two channeltrons, which represents the reflected beam polarization, is clearly visible.

Figure: Measured Current at Detectors against Incident Beam Current for a Beam Energy of $(3011.00\pm 0.35)eV$ and Both Sample Magnetization Directions.

Similar data were also taken for two other beam energies, and the whole experiment was run twice to verify its repeatability.