Morris G D, Macfarlane W A, Chow K H, Salman Z, Arseneau D J, Daviel S, Hatakeyama A, Kreitzman S R, Levy C D P, Poutissou R, Heffner R H, Elenewski J E, Greene L H, Kiefl R F
Los Alamos National Laboratory, K764, Los Alamos, New Mexico 87545, USA.
Phys Rev Lett. 2004 Oct 8;93(15):157601. doi: 10.1103/PhysRevLett.93.157601. Epub 2004 Oct 5.
Depth-controlled beta-NMR can be used to probe the magnetic properties of thin films and interfaces on a nanometer length scale. A 30 keV beam of highly spin-polarized 8Li+ ions was slowed down and implanted into a 50 nm film of Ag deposited on a SrTiO3 substrate. A novel high field beta-NMR spectrometer was used to observe two well resolved resonances which are attributed to Li occupying substitutional and octahedral interstitial sites in the Ag lattice. The temperature dependence of the Knight shifts and spin relaxation rates are consistent with the Korringa law for a simple metal, implying that the NMR of implanted 8Li reflects the spin suspectibility of bulk metallic silver.
深度控制的β核磁共振可用于在纳米长度尺度上探测薄膜和界面的磁性。一束30 keV的高自旋极化8Li+离子束被减速并注入到沉积在SrTiO3衬底上的50 nm厚的Ag薄膜中。使用一种新型的高场β核磁共振光谱仪观察到两个分辨良好的共振峰，这归因于Li占据了Ag晶格中的替代位置和八面体间隙位置。奈特位移和自旋弛豫率的温度依赖性与简单金属的科林加定律一致，这意味着注入的8Li的核磁共振反映了块状金属银的自旋磁化率。
