Dr. Ezekiel Johnston-Halperin
The Condensed Matter & Surface Sciences Colloquium Series presents Ezekiel Johnston-Halperin on “New Directions for Active Spintronics: New Experimental Approaches and Novel Materials” on Thursday, Jan. 29, at 4:10 p.m. in Walter Lecture Hall 245.
Abstract: Spintronics is an emerging field of study that explores the use of the electron spin, its intrinsic magnetic moment, rather than its charge for the creation of electronic devices. Unlike charge, which has fundamental limitations on speed and power dissipation due to the long range nature of the Coulomb interaction, electron spin operations can in principle take place at THz frequencies and with extremely low (perhaps zero?) dissipation. In addition, when linked to long range magnetic ordering (i.e. ferromagnetism) spin states can be non-volatile with lifetimes measured in decades. However, realizing this promise will require fundamental advances in our understanding of the mechanisms governing spin transport and manipulation as well as the fundamental materials properties that will define the playing field for this emerging technology. In this talk I will discuss both new phenomena and new directions for magnetic/spin-active materials. First, I will present recent studies in the use of ferromagnetic resonance (FMR) to drive pure spin currents, i.e. spin transport in the absence of charge transport. This seemingly contradictory parsing of the spin and charge degrees of freedom of the electron is a direct consequence of the correlated nature of electrons in solids and promises to bridge a critical gap in the development of a fully functional spintronics. Second, I will present significant materials breakthroughs in the development of organic-based magnetic materials that promise to add spin/magnetic functionality to the commercial success of organic based optoelectronic and electronic devices such as organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFETs).
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