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arXiv 0803.3874cond-mat.str-elcond-mat.mtrl-sci
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Ag/Fe多层膜超精细场的8Li β探测核磁共振研究

Hyperfine Fields in an Ag/Fe Multilayer Film Investigated with 8Li beta-Detected Nuclear Magnetic Resonance

T. A. Keeler, Z. Salman, K. H. Chow, B. Heinrich, M. D. Hossian, B. Kardasz, R. F. Kiefl, S. R. Kreitzman, C. D. P. Levy, W. A. MacFarlane, O. Mosendz, T. J. Pa… 展开作者

T. A. Keeler, Z. Salman, K. H. Chow, B. Heinrich, M. D. Hossian, B. Kardasz, R. F. Kiefl, S. R. Kreitzman, C. D. P. Levy, W. A. MacFarlane, O. Mosendz, T. J. Parolin, M. R. Pearson, D. Wang

备注：
5 pages, 4 figure. To be published in Phys. Rev. B
发表信息：
Phys. Rev. B 77, 144429 (2008)
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摘要：

利用低能$β$探测的核磁共振（$β$ -NMR）研究了GaAs衬底上生长的Au（40 μ m）/Ag（200 μ m）/Fe（140 μ m）（001）磁性多层膜（MML）中Fe在Ag层中感生的超精细磁场的空间依赖性.与本征Ag相比，Ag层中的共振线形显示出显著的加宽。这种加宽归因于磁性Fe层在该层中产生的大的感应磁场。我们发现，在Ag中的诱导超精细场遵循幂律衰减远离Ag/Fe界面与功率$-1.93(8)$，和场外推到$0.23(5)$ T的接口。

英文摘要：

Low energy $β$-detected nuclear magnetic resonance ($β$-NMR) was used to investigate the spatial dependence of the hyperfine magnetic fields induced by Fe in the nonmagnetic Ag of an Au(40 Å)/Ag(200 Å)/Fe(140 Å) (001) magnetic multilayer (MML) grown on GaAs. The resonance lineshape in the Ag layer shows dramatic broadening compared to intrinsic Ag. This broadening is attributed to large induced magnetic fields in this layer by the magnetic Fe layer. We find that the induced hyperfine field in the Ag follows a power law decay away from the Ag/Fe interface with power $-1.93(8)$, and a field extrapolated to $0.23(5)$ T at the interface.

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