|Title||Low-energy spin-polarized radioactive beams as a nano-scale probe of matter|
|Publication Type||Journal Article|
|Year of Publication||2003|
|Authors||Kiefl, RF, MacFarlane, WA, Morris, GD, Amaudruz, P, Arseneau, D, Azumi, H, Baartman, R, Beals, TR, Behr, J, Bommas, C, Brewer, JH, Chow, KH, Dumont, E, Dunsiger, SR, Daviel, S, Greene, L, Hatakeyama, A, Heffner, RH, Hirayama, Y, Hitti, B, Kreitzman, SR, Levy, CDP, Miller, RI, Olivo, M, Poutissou, R|
|Pagination||189 - 195|
We have commissioned a polarized low-energy 8Li ion beam line, which together with a high-field β-NMR spectrometer, can act as sensitive new probe of thin films and interfaces. The implantation energy can be continuously adjusted from 1 to 90 keV and the maximum polarization achieved thus far is 80%. This instrument opens up new applications for β-NMR which parallel and complement efforts with low-energy muons. For example, it is possible to probe the magnetic field distribution near the surface of a material by stopping a polarized 8Li beam in a thin overlayer of Ag. Since the 8Li adopts a site with cubic symmetry in Ag there is no quadrupolar splitting of the resonance, and the 8Li acts as a purely magnetic sensor.