A Jan. 30, 2013 news release about a 3D microchip developed from a spintronic chip is available on EurekAlert here or at the University of Cambridge here and provides background about why a 3D microchip would be developed,
Scientists from the University of Cambridge have created, for the first time, a new type of microchip which allows information to travel in three dimensions. Currently, microchips can only pass digital information in a very limited way – from either left to right or front to back. …
Dr Reinoud Lavrijsen, an author on the paper from the University of Cambridge, said: “Today’s chips are like bungalows – everything happens on the same floor. We’ve created the stairways allowing information to pass between floors.”
Here are some of the technical details,
For the research, the Cambridge scientists used a special type of microchip called a spintronic chip which exploits the electron’s tiny magnetic moment or ‘spin’ (unlike the majority of today’s chips which use charge-based electronic technology). Spintronic chips are increasingly being used in computers, and it is widely believed that within the next few years they will become the standard memory chip.
To create the microchip, the researchers used an experimental technique called ‘sputtering’. They effectively made a club-sandwich on a silicon chip of cobalt, platinum and ruthenium atoms. The cobalt and platinum atoms store the digital information in a similar way to how a hard disk drive stores data. The ruthenium atoms act as messengers, communicating that information between neighbouring layers of cobalt and platinum. Each of the layers is only a few atoms thick.
They then used a laser technique called MOKE to probe the data content of the different layers. As they switched a magnetic field on and off they saw in the MOKE signal the data climbing layer by layer from the bottom of the chip to the top. They then confirmed the results using a different measurement method.
Here’s the source for the quote used in the headline,
Professor Russell Cowburn, lead researcher of the study from the Cavendish Laboratory, the University of Cambridge’s Department of Physics, said: “Each step on our spintronic staircase is only a few atoms high. I find it amazing that by using nanotechnology not only can we build structures with such precision in the lab but also using advanced laser instruments we can actually see the data climbing this nano-staircase step by step.
An artistic representation of the microchip and the data,
Here’s a citation and a link to the paper,
Magnetic ratchet for three-dimensional spintronic memory and logic by Reinoud Lavrijsen, Ji-Hyun Lee, Amalio Fernández-Pacheco,Dorothée C. M. C. Petit, Rhodri Mansell, & Russell P. Cowburn. Nature, 493, 647–650 (31 January 2013) doi:10.1038/nature11733 (Published online 30 January 2013)
The paper is behind a paywall.