Magnetic memory-based information storage systems are getting smaller and smaller, while their capacities are getting larger. However, there is a limit to how small they can get. If the tiny magnets used to store information are smaller than around five nanometres (millionths of a millimetre), vibrations caused by temperature can erase their orientation and, therefore, the information they contain. This is known as the superparamagnetic limit, which physically limits the capacity of magnetic storage systems to some 100 Gbit/in2.
An international team of scientists, which included ICREA researcher Josep Nogués of the UAB’s Physics Department, has discovered a way of breaking that limit. The researchers have discovered that it is possible to attain extra stability of the magnetic nanoparticles that store information if they are anchored to a matrix with particular magnetic properties (antiferromagnetic matrix). The discovery opens new horizons for magnetic storage technologies, the miniaturisation of such common items as computer hard drives and improvements of other magnetic systems.
The scientists made the discovery using a system made up of cobalt particles of between 3 and 4 nanometres. When these particles are distributed in a matrix similar to one normally used as a base for magnetic particles, their capacity to store information is lost when the temperature rises. However, the same particles are much more resistant to the effects of temperature if they are distributed in a matrix with antiferromagnetic properties.
Octavi López Coronado | alfa
A new path for electron optics in solid-state systems
15.07.2020 | ETH Zurich Department of Physics
Black phosphorus-based van der Waals heterostructures for mid-infrared light-emission applications
13.07.2020 | Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, Chinese Academy
A novel mechanism for electron optics in two-dimensional solid-state systems opens up a route to engineering quantum-optical phenomena in a variety of materials
Electrons can interfere in the same manner as water, acoustical or light waves do. When exploited in solid-state materials, such effects promise novel...
Biochemists at Martin Luther University Halle-Wittenberg (MLU) have used a standard electron cryo-microscope to achieve surprisingly good images that are on par with those taken by far more sophisticated equipment. They have succeeded in determining the structure of ferritin almost at the atomic level. Their results were published in the journal "PLOS ONE".
Electron cryo-microscopy has become increasingly important in recent years, especially in shedding light on protein structures. The developers of the new...
New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices
Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...
Kiel physics team observed extremely fast electronic changes in real time in a special material class
In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...
Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.
Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....
07.07.2020 | Event News
02.07.2020 | Event News
19.05.2020 | Event News
15.07.2020 | Architecture and Construction
15.07.2020 | Power and Electrical Engineering
15.07.2020 | Physics and Astronomy