Senior Theses

Publication Date

5-2013

Document Type

Thesis (Linfield Access)

Degree Name

Bachelor of Arts in Physics

Department

Physics

Faculty Advisor(s)

Michael Crosser (Thesis Advisor)
Joelle Murray & Donald Schnitzler (Committee Members)

Subject Categories

Physics

Abstract

The application of spintronics (spin-electronics) requires highly optimized devices. We aim to understand spin transport and its dependence on film thickness so that the geometry of the device can be improved. This experiment investigates how the thickness of the sample affects the propagation of spin current (SC). Additionally we aim to reduce the effects from spin accumulation and reflection by the addition of a FeMn spin sink layer. Two series of sample multilayers are sputtered onto sapphire substrate. The first consists of Pt (d nm), and Permalloy (Py) (5 nm), where d is the variable thickness; the second series adds FeMn (0.5 nm) beneath Pt. SC is then induced by the Spin Hall Effect (SHE) where the effect on Py is measured by Brillouin Light Scattering (BLS) spectroscopy. Our data show the effects of SC increase inversely proportional to sample thickness and the addition of a spin sink layer improves these effects to a certain point where unexpected behavior occurs at d ¡ 3nm.

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