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Hyperfine magnetic fields in Fe/Ag magnetic multilayers probed with low energy spin polarized ⁸Li

University of British Columbia

This thesis is a presentation of experiments examining the induced hyperfine magnetism in the nonmagnetic layers of two thin film magnetic multilayers, Au(40Å) / Ag(200Å) / Fe(140Å) and Au(40Å) / Ag(800Å) / Fe(20Å) grown on GaAs(001) single crystal substrates. The main technique used in this study was beta-detected nuclear magnetic resonance (βNMR) conducted at TRIUMF laboratories in Vancouver, British Columbia. βNMR makes NMR measurements on radioactive ⁸Li⁺ (τ=1.21 sec) nuclei that are implanted directly into the sample. Resonant βNMR experiments showed strong induced magnetism in the non-magnetic Ag layer due the magnetic Fe. Comparison of a theoretical model to experimental results on the Au(40Å) / Ag(200Å) / Fe(140Å) sample suggest that the induced hyperfine magnetism decays with distance into the Ag layer from the magnetic/nonmagnetic interface like x⁻¹·⁸⁴ from a maximum of ~0.3 T at the magnetic/nonmagnetic interface.

Text

2010-01-16

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http://hdl.handle.net/2429/18291

Physics

University of British Columbia

UBCV

DSpace