-NMR in thin metal films

MacFarlane, W. A.; Morris, G. D.; Beals, T. R.; Chow, K. H.; Baartman, R.; Daviel, S.; Dunsiger, S. R.; Hatakeyama, A.; Kreitzman, S. R.; Levy, C.D.P.; Miller, R. I.; Nichol, K.; Poutissou, R.; Kiefl, R. F.

doi:10.1016/s0921-4526(02)01604-6

Cited by 16 publications

(25 citation statements)

References 8 publications

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“…3 [9]. Preliminary experiments [10] on another less well characterized Ag film showed very similar behavior, confirming that this behavior is intrinsic to Ag. The shift we observe is a common effect in the NMR of metals, where it is due to coupling of the nuclei to the paramagnetic Pauli spin susceptibility of the conduction electrons, i.e., a Knight shift [11].…”

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confidence: 60%

Depth-Controlledβ-NMR ofLi8in a Thin Silver Film

et al. 2004

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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.

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confidence: 60%

Depth-Controlledβ-NMR ofLi8in a Thin Silver Film

et al. 2004

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“…However, conventional NMR is often not sensitive enough to investigate thin film structures and generally cannot be used to study thick conducting samples. Recently, a high field, beta-detected 8 Li + nuclear magnetic resonance (β-NMR) spectrometer with depth control was developed at TRIUMF in Vancouver, Canada. This novel instrument utilizes 8 Li + (spin 2, lifetime 1.21 s) as the radioactive nuclear spin probe and provides enough sensitivity to allow NMR studies of thin metal structures to be carried out [1].…”

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confidence: 99%

“…Recently, a high field, beta-detected 8 Li + nuclear magnetic resonance (β-NMR) spectrometer with depth control was developed at TRIUMF in Vancouver, Canada. This novel instrument utilizes 8 Li + (spin 2, lifetime 1.21 s) as the radioactive nuclear spin probe and provides enough sensitivity to allow NMR studies of thin metal structures to be carried out [1]. These measurements are aimed at better characterizing the behavior of 8 Li + as a prototypical impurity in metals and to enable investigations of finite-size effects in these materials.…”

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confidence: 99%

β-NMR of isolatedLi+8implanted into a thin copper film

et al. 2007

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Depth-controlled β-NMR was used to study highly spin-polarized 8 Li + in a Cu film of thickness 100 nm deposited onto a MgO substrate. The positive Knight Shifts and spin relaxation data show that 8 Li + occupies two sites at low temperatures, assigned to be the substitutional (S) and octahedral (O) interstitial sites. Between 50 to 100 K, there is a site change from O to S. The temperature dependence of the Knight shifts and spin-lattice relaxation rates at high temperatures, i.e. when all the Li are in the S site, is consistent with the Korringa Law for a simple metal.

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“…1 shows typical resonance spectra of 8 Li + in Pt at 295 and 6 K. In contrast to previous β-NMR studies on other fcc metals [Ag, 24,25 Au, 24,26 Cu, 27,28 and Pd (Ref. 29)], we find a single narrow resonance at all temperatures, with no evidence of multiple sites for the 8 Li + below 300 K. The observation of a single narrow resonance close to the Larmor frequency with no quadrupolar splitting establishes that 8 Li is located at a cubic site, which, in the fcc lattice could be the substitutional, the octahedral interstitial, or the tetrahedral interstitial site.…”

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confidence: 72%

β-NMR study of isolated8Li+in the enhanced paramagnet platinum

Ofer

Chow²,

Fan³

et al. 2012

Phys. Rev. B

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We report β-detected nuclear magnetic resonance (β-NMR) measurements of 8 Li + implanted into high purity Pt. The frequency of the 8 Li β-NMR resonance and the spin-lattice relaxation rates 1/T 1 were measured at temperatures ranging from 3 to 300 K. Remarkably, both the spin-lattice relaxation rate and the Knight shift K depend linearly on temperature T although the bulk susceptibility does not. K is found to scale with the Curie-Weiss dependence of the Pt susceptibility extrapolated to low temperatures. This is attributed to a defect response of the enhanced paramagnetism of Pt, i.e., the presence of the interstitial Li + locally relieves the tendency for the Curie-Weiss susceptibility to saturate at low T . We propose that the low temperature saturation in χ of Pt may be related to an interband coupling between the s and d bands that is disrupted locally by the presence of the Li + .

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-NMR in thin metal films

Cited by 16 publications

References 8 publications

Depth-Controlledβ-NMR ofLi8in a Thin Silver Film

Depth-Controlledβ-NMR ofLi8in a Thin Silver Film

β-NMR of isolatedLi+8implanted into a thin copper film

β-NMR study of isolated8Li+in the enhanced paramagnet platinum

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