β-NMR Study of a buried Mn δ-doped layer in a silicon host

[摘要] Low temperature growth methods were used to encapsulate a buried Mn δ-doping layer into a silicon host. A β-NMR investigation was performed of the magnetic properties in the temperature range 10-300 K using spin-polarized8Li+. A depth-dependent broadening and shift of the NMR resonance was detected that is consistent with internal fields distributed at depths of 10-30 nm beneath the surface. At low temperatures, a negative relative shift occurred and the resonance was significantly broadened. At 300 K the line-shape could be described by a single Gaussian line, however, at 10 K the line is best approximated by a two component Lorentzian shape consisting of a broad and narrow component as anticipated for a diluted magnetic alloy. The overall magnitude of the resonance shift at both temperatures is small suggesting a weak interaction between the8Li+and the magnetic Mn environment.

[发布机构] Quantum Matter Institute, University of British Columbia, Vancouver; BC; V6T 1Z4, Canada^1;Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver; BC; V6T 1Z1, Canada^2;Chemistry Department, University of British Columbia, Vancouver; BC; V6T 1Z1, Canada^3;TRIUMF, 4004 Wesbrook Mall, Vancouver; BC; V6T 2A3, Canada^4;Physik-Department, Technische Universität München, James-Franck-Straße 1, Garching bei München; 85748, Germany^5;IBM Research-Zurich, Säumerstrasse 4, Rüschlikon; 8803, Switzerland^6

[关键词] Delta-doped layers;Depth dependents;Lorentzian shapes;Low temperature growth;Low temperatures;Resonance shift;Temperature range;Weak interactions