Figure 2

One-magnet-only Mott spin junction and evidence of spin polarisation of backscattered electrons. (a) −P _x (B) (full squares) and −P _z (B) (empty squares) measured with SEMPA (primary energy: 10 keV). The applied magnetic field (horizontal scale, common to a, b, and c and given in c) is given in units of Tesla. (b) −P _x (B) (full circles) and −P _z (B) (empty circles) measured in the Fowler-Nordheim regime of STM (d = 100 nm, primary energy: 62 eV, field emission current: ≈60 nA). Lower part: STM image (256 × 85 pixels) of a region of an 8-AL-thick Fe film covering a W (110) surface, on top of which the hysteresis curve is measured. (c) Full circles: −P _x (B) on the Fe-uncovered surface measured in the Fowler-Nordheim regime of STM (d = 54 nm, primary energy: 71 eV, field emission current: ≈320 nA). Full squares: −P _x (B) on the Fe-uncovered surface measured with SEMPA (shifted by +0.1 for clarity). Lower part: STM image (512 × 169 pixels) of the Fe-uncovered W (110) surface on top of which the spin polarisation is measured.