[Triumf-seminars] TRIUMF Colloquium today at 10:00

[TRIUMF Seminars]

Date/Time: Tue 2018-01-23 at 10:00

Location:  Auditorium          

Speaker:   Sarah Dunsiger (Simon Fraser U)

Title:     Depth Resolved Spin Resonance Techniques for Spin Transport Applications

Abstract: The fields of spintronics aims to combine the data storage capabilities of magnetic media with the
data handling capabilities of the semiconductor industry. As such, the controlled manipulation of a
nonequilbrium spin population is required. For example, spin pumping relies on the precession of the
magnetisation induced in a ferromagnet excited by a radio-frequency magnetic field on resonance
(FMR). The magnetisation precession around an effective magnetic field is damped via the emission of
a polarised spin current into the neighbouring normal metal. The flow of this spin current Js across a ferromagnet/normal metal interface may then be detected. Indirect evidence of spin pumping from bulk transport measurements of the charge current Jc induced through the Inverse Spin Hall Effect (ISHE) has been reported in a variety of artificial heterostructures. Our ultimate goal is to look for direct evidence of spin pumping into the nonmagnetic layer of the heterostructures using a depth resolved local probe, measuring the spin diffusion length and spin decoherence timescales.

I will discuss recent investigations using the depth resolved spin resonance techniques Low Energy muSR and beta-detected Nuclear Magnetic Resonance (beta-NMR) of the internal magnetic fields and spin lattice relaxation in simple nonmagnetic metals and semiconductors adjacent to archetypal magnets, artificial heterostructures of great interest in curiosity driven research but also of relevance for spin transport applications.



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