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FRINAT-Matematikk og naturvitenskap

Point Contact Investigations of Structured Magnetic Materials

Tildelt: kr 5,2 mill.

The research proposed here will provide information on transport properties through thransport measurements through magnetic structures utilising laterally resolved point contact measurements. We will use the combined powers of surface science technique s, lithography, optical characterisation and scanning probe microscopy (SPM) based point contact spectroscopy (PCS) to study the magnetoresistive properties of nanoscale model structures and interfaces. Through the use of a SPM custom built for point cont act measurements we will characterize the local transport properties of materials and link them to the fundamental properties of the system as characterised by supplemental techniques. The experiments will be performed both on in situ growth of important model systems as well as on nanostructured materials grown and patterned through other processes such as e-beam lithography ex situ. Phenomena to be investigated are coupling between micromagnetic properties of spin valves of well-specified shape and th eir current induced spin switching properties. In particular the possibility to use a current injected locally to control the switching behaviour will be investigated. The possibility to tailor magnetic films and interfaces to enhance magnetoresitivity wi ll be explored through growth of well characterised films in situ. This kind of structures will also be used in conjunction with the sensitivity to scattering processes of the point contact to further our understanding on details in the scattering process es at interfaces and accordingly magnetoresistive properties. Through the ability to probe these properties laterally new information will be provided which will enhance our understanding of the influence of fundamental material properties and geometry o n the full magnetoresitive behaviour of possible future devices.

Budsjettformål:

FRINAT-Matematikk og naturvitenskap