SURFACE ELECTRON SPIN POLARIZATION OF THE PROPOSED HALF-METALLIC FERROMAGNET NICKEL - MANGANESE - ANTIMONY
TAYLOR, KELLY JAY
Master of Arts
Electron capture spectroscopy (ECS) measures the surface electron spin polarization (ESP) by passing a deuteron ion beam very close to and grazing an atomically flat sample. Polarized electrons that are captured polarize the deuterons by the hyperfine interaction. The polarization of the deuterons is measured by the asymmetry of scattered alpha particles resulting from the nuclear reaction D(T,n)$\alpha$. On the proposed, half-metallic, half-semiconducting, ferromagnetic material, NiMnSb, electron capture spectroscopy measures a surface electron spin polarization (ESP) of +13%, establishing unambiguously that long-range, surface ferromagnetic order exists for this ternary alloy.
Condensed matter physics