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Spin-orbital effects in spintronics

Speaker: 
Giovanni Vignale (University of Missouri-Columbia)
Date: 
Wed, 22/06/2016 - 11:00am to 12:00pm
Location: 
Physics Conference Room (S11-02-07)
Host: 
Centre for Advanced 2D Materials
Event Type: 
Seminars

Abstract: Layered structures of materials with different magnetic and/or spin orbital properties are rapidly emerging as most promising candidates for spintronic applications. A slew of new effects is under study, which have no analogue in bulk materials or differ subtly from their three-dimensional counterparts. Spin polarization and spin transfer torque can be generated by passing an electric current near an interface. Novel types of anisotropic magnetoresistance (e.g., the recently observed “unidirectional spin Hall magnetore-
sistance”) are possible. Spin polarized currents may produce a nonlocal form of the anomalous Hall effect. In this talk I review our recent theoretical work on these effects vis-a-vis experiment. In particular, I present a new theory of the nonlocal anomalous Hall effect, which occurs in a non-magnetic heavy metal (eg. Pt) that is interfaced with a ferromagnet.

About the speaker: Giovanni Vignale is Curators’ Professor of Physics at the University of Missouri-Columbia where he leads the Theoretical Condensed Matter Physics group. After graduating from the Scuola Normale Superiore in Pisa (Italy) in 1979 and gaining his Ph.D. at Northwestern University (USA) in 1984, he carried out research at the Max-Planck-Institute for Solid State Research in Stuttgart (Germany), and Oak Ridge National Laboratory (USA). He became a Fellow of the American Physical Society in 1997. Professor Vignale’s main areas of research are many-body theory and density-functional theory, where he is recognized by the community for his seminal contributions on spintronics, on the density functional theory of electronic systems in the presence of magnetic fields, and on the time-dependent current density functional theory. He is the author of two books, the well known textbook “Quantum Theory of the Electron Liquid” and “The Beautiful Invisible”, and has published more than 200 research papers.

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