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Lecture Tamalika Banerjee


15 november 2007 FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Tamalika Banerjee
Affiliation: MESA+ Institute of Technology, Universiteit Twente
Title: Spin filtering of hot electrons/holes in spintronic structures
Date: Thu Nov 15, 2007
Start: 14.00
Location: FWN-Building 5118.-156
Host: T.T.M. Palstra
Telephone: +31 50 363 4419


Spin-dependent transmission of non-equilibrium electrons and holes in metallic ferromagnets is relevant to the understanding of the physics of spintronic structures for application in devices as magnetic sensors, Magnetic-RAM (field and current driven), spin-FET etc. In this talk, I will discuss how we have used hot electrons and hot holes to address several issues of spin filtering and transmission, momentum scattering and mechanisms of scattering process in magnetic tunnel junctions as well as in hybrid devices of a ferromagnet-semiconductor. I will discuss about a new technique of Ballistic Hole Magnetic Microscopy and show large spin-valve effect of 130% in NiFe/Au/Co trilayers. We have also applied this technique to magnetic imaging in a similar spin valve structure and find its resolution to be better than 20 nm. This technique can be well applied to several other ferromagnets (both metals and oxides). I shall also discuss the origin of spin-asymmetry of transmission of hot electrons in Fe for which recent ab initio calculations have shown similar inelastic lifetimes for both the majority and minority electrons. In the last part of my talk, I shall speak about the spin-dependent attenuation of hot holes with opposite spin asymmetry due to elastic and inelastic scattering in a spintronic device as a p-type (hot hole) Magnetic Tunnel Transistor.

Laatst gewijzigd:22 oktober 2012 14:31