The picture shows the 2 mile long linear accelerator as the background and the experiment and results superimposed as a schematic. The schematic shows the magnetic field surrounding the beam and the magnetic pattern (which is of micrometre size) written into a sample by the beam.
The speed of magnetic recording – a crucial factor in a computer’s power and multimedia capabilities – depends on how fast one can switch a magnet’s poles. An experiment at the Stanford Synchrotron Radiation Laboratory (SSRL) found that the ultimate speed of magnetic switching is at least 1,000 times slower than previously expected. The result, which appears in the April 22 issue of the journal Nature, has implications for future hard disk computer drive technologies.
In the push toward ever-faster magnetic recording, experts expected to find a physical limit, a threshold speed beyond which materials would respond chaotically. “If you had asked me a year ago, ‘How fast does one have to create a pulse that does not switch magnetization?’ my answer would have been one femtosecond (one thousandth of a trillionth of a second),” said Jo Stöhr, Deputy Director of SSRL. “Chaotic behavior was not expected in this experiment, which ran in the picosecond (trillionth-of-a-second) range.”
The SSRL is a division of the Stanford Linear Accelerator Center (SLAC), a U.S. Department of Energy (DOE) research facility operated by Stanford University. The collaboration for the Nature paper was led by SSRL scientists Hans Christoph Siegmann and Professor Joachim Stöhr , and included researchers from Seagate Technology, the world’s largest manufacturer of hard disk computer drives.
Neil Calder | SLAC
On Mars, sands shift to a different drum
24.05.2019 | University of Arizona
New Boost for ToCoTronics
23.05.2019 | Julius-Maximilians-Universität Würzburg
A new assessment of NASA's record of global temperatures revealed that the agency's estimate of Earth's long-term temperature rise in recent decades is accurate to within less than a tenth of a degree Fahrenheit, providing confidence that past and future research is correctly capturing rising surface temperatures.
The most complete assessment ever of statistical uncertainty within the GISS Surface Temperature Analysis (GISTEMP) data product shows that the annual values...
Physicists at the University of Basel are able to show for the first time how a single electron looks in an artificial atom. A newly developed method enables them to show the probability of an electron being present in a space. This allows improved control of electron spins, which could serve as the smallest information unit in a future quantum computer. The experiments were published in Physical Review Letters and the related theory in Physical Review B.
The spin of an electron is a promising candidate for use as the smallest information unit (qubit) of a quantum computer. Controlling and switching this spin or...
Engineers at the University of Tokyo continually pioneer new ways to improve battery technology. Professor Atsuo Yamada and his team recently developed a...
With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.
Many scientists are currently working on investigating how quantum advantage can be exploited on hardware already available today. Three years ago, physicists...
'Quantum technologies' utilise the unique phenomena of quantum superposition and entanglement to encode and process information, with potentially profound benefits to a wide range of information technologies from communications to sensing and computing.
However a major challenge in developing these technologies is that the quantum phenomena are very fragile, and only a handful of physical systems have been...
29.04.2019 | Event News
17.04.2019 | Event News
15.04.2019 | Event News
24.05.2019 | Physics and Astronomy
24.05.2019 | Medical Engineering
24.05.2019 | Life Sciences