Elusive spintronics success could lead to single chip for processing and memory

Elusive spintronics success could lead to single chip for processing and memory
Dr Alan Drew

(PhysOrg.com) -- Researchers from Queen Mary, University of London (UK) and the University of Fribourg (Switzerland) have shown that a magnetically polarised current can be manipulated by electric fields.

Published this week in the journal , this important discovery opens up the prospect of simultaneously processing and storing data on electrons held in the molecular structure of - combining and processing power on the same chip.

"This is especially exciting, as this discovery has been made with flexible organic semiconductors, which are set to be the new generation of displays for mobile devices, TVs and computer monitors, and could offer a step-change in and reduced weight of these devices," said Dr Alan Drew, from Queen Mary's School of Physics, who led the research.

'Spintronics' - spin transport electronics - has rapidly become the universally used technology for computer hard disks. Designed in thin layers of magnetic and non-magnetic materials, Giant Magnetoresistive (GMR) spin valves use the magnetic properties, or 'spin', of electrons to detect computer data stored in magnetic bits. In contrast, computer processing relies on streams of electrically charged electrons flowing around a tiny circuit etched into a microchip.

Dr Drew and his team have investigated how layers of Lithium Fluoride (LiF) - a material that has an intrinsic electric field - can modify the spin of electrons transported through these spin valves. He explains: "While in theory, devices that combine electron charge and spin are conceptually straightforward, this is the first time anybody has shown it is possible to proactively control spin with electric fields."

Professor Christian Bernhard, from the University of Fribourg Physics Department, describes their successful technique: "Using the direct spectroscopic technique Low Energy Muon Spin Rotation (LE-μSR), our experiments have visualised the extracted spin polarisation close to buried interfaces of a spin valve."

The experiments were performed at the Paul Scherrer Institute, the only institution worldwide; where this technique is available. The method employs the of muons - unstable subatomic particles. "In such an experiment the muons are shot into the material and when they decay, the decay products carry information about the magnetic processes inside the material," explains Professor Elvezio Morenzoni from PSI, where the technique has been developed. "The unique thing about low energy muons is that they can be placed specifically in a particular layer of a multi-layer system. Thus using this method one can study the magnetism in any single layer separately."

More information: The paper "Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer" is authored by L. Schulz, L. Nuccio, M.Willis, P. Desai, P. Shakya, T. Kreouzis, V. K. Malik, C. Bernhard, F. L. Pratt, N. A. Morley, A. Suter, G. J. Nieuwenhuys, T. Prokscha, E. Morenzoni,W. P. Gillin and A. J. Drew.

Citation: Elusive spintronics success could lead to single chip for processing and memory (2010, December 7) retrieved 19 March 2024 from https://phys.org/news/2010-12-elusive-spintronics-success-chip-memory.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Spin-polarized electrons on demand

0 shares

Feedback to editors