Physicist at the Universities of Bath, Bristol and Leeds have discovered a way to precisely control the pattern of magnetic fields in thin magnetic films, which can be used to store information.
The discovery has important consequences for the IT industry, as current technology memory storage has limited scope for develop further. The density with which information can be stored magnetically in permanent memory - hard drives - is reaching a natural limit related to the size of the magnetic particles used. The much faster silicon-chip based random access memory - RAM - in computers loses the information stored when the power is switched off.
The key advance of the recent research has been in developing ways to use high energy beams of gallium ions to artificially control the direction of the magnetic field in regions of cobalt films just a few atoms thick.
The direction of the field can be used to store information: in this case “up” or “down” correspond to the “1” or “0” that form the basis of binary information storage in computers.
Further, the physicists have demonstrated that the direction of these magnetic areas can be “read” by measuring their electrical resistance. This can be done much faster than the system for reading information on current hard drives. They propose that the magnetic state can be switched from “up” to “down” with a short pulse of electrical current, thereby fulfilling all the requirements for a fast magnetic memory cell.
Using the new technology, computers will never lose memory even during a power cut – as soon as the power is restored, the data will reappear.
Professor Simon Bending, of the University of Bath's Department of Physics, said: “The results are important as they suggest a new route for developing high density magnetic memory chips which will not lose information when the power is switched off. For the first time data will be written and read very fast using only electrical currents.”
“We’re particularly pleased as we were told in the beginning that our approach probably would not work, but we persevered and now it has definitely paid off.”
Professor Bending worked with Dr Simon Crampin, Atif Aziz and Hywel Roberts in Bath, Dr Peter Heard of the University of Bristol and Dr Chris Marrows of the University of Leeds.
Another approach to overcoming the problem of storing data permanently with rapid retrieval times is that of magnetic random access memory chips (MRAMs); prototypes of these have already been developed by several companies. However, MRAM uses the stray magnetic fields generated by wires that carry a high electrical current to switch the data state from “up” to “down”, which greatly limits the density of information storage.
In contrast, if the approach at Bath is developed commercially, this would allow the manufacture of magnetic memory chips with much higher packing densities, which can operate many times faster.
A paper written by the researchers appeared recently in the journal Physical Review Letters, entitled: Angular Dependence of Domain Wall Resistivity in Artificial Magnetic Domain Structures.
Tony Trueman | alfa
Hubble sees Neptune's mysterious shrinking storm
16.02.2018 | NASA/Goddard Space Flight Center
Supermassive black hole model predicts characteristic light signals at cusp of collision
15.02.2018 | Rochester Institute of Technology
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).
Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
16.02.2018 | Information Technology
16.02.2018 | Health and Medicine
16.02.2018 | Physics and Astronomy