Presentation on theme: "Nanomagnetic structures for digital logic Russell Cowburn Durham University Physics Department, UK www.durham.ac.uk/nano.magnetics."— Presentation transcript:
Nanomagnetic structures for digital logic Russell Cowburn Durham University Physics Department, UK www.durham.ac.uk/nano.magnetics
Themes in spintronics Electron current Type 1: Information carried by spin polarised electrons in non- magnetic medium. Processed by ferromagnetic material. Type 2: Information carried by ferromagnetic material. Probed by electronic current.
Information transport by nanomagnets... H CK Input pin Number of dots per chain= 70 Dot diameter= 110nm Dot pitch= 135nm Dot thickness= 10nm ROOM TEMPERATURE Cowburn et al. Science 287, 1466 (2000) AND-gate
Clock Input=‘0’ Input=‘1’... Information transport by nanomagnets
Reasons to love nanomagnetic logic All-metallic good scaling to the nanometre scale All on a single plane very cheap to manufacture Any substrate flexible, plastic electronics Devices have gain, full logic family available Energy per operation optimal (40 – 2000 k B T) 10 6 times lower speed-power product than CMOS Reasonably high density A complete architecture for nanoelectronics
Reasons to hate nanomagnetic logic Poor prospects for very high speed (< 1GHz) Difficult to apply magnetic field efficiently No topological invariance of circuits Edge roughness needs to be controlled
Conclusion We can emulate behaviour previously found only in semiconductor devices using all-metallic ferromagnetic materials. This offers a new paradigm for logic circuits in the future. Industrially viable to make low-cost, low-performance chips
Acknowledgements Durham University Physics Department: Dr Michael CookeColm Faulkner Dr Dan AllwoodPaul Brierly Dr Xiong GangMark Hibbert Dr Del AtkinsonKevin McGee Dr Nicolas Vernier Cambridge University Engineering Department: Prof. Mark Welland Eastgate Investment Ltd www.durham.ac.uk/nano.magnetics
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