Light-tunable magnets would work only in the coolest computers.
© Getty Images
Light-sensitive ’plastic’ magnets could replace your hard drive.
A ’plastic’ magnet that responds to light could lead to new ways of storing and reading large amounts of computer data. Light would be used to store information in cheap, fast and high-capacity ’magneto-optic’ memories.
The light-switchable magnet is the first to be made from organic (carbon-based) molecules. This means its discoverers, Arthur Epstein of Ohio State University in Columbus and Joel Miller of the University of Utah in Salt Lake City, should be able to use clever chemical tricks to fine-tune the properties of the material1.
Magnetic memories store information in tiny ’magnetized domains’, where magnetic field lines points either ’up’ or ’down’. This allows magnetic media to store the binary (zeros and ones) data of the digital world. In conventional magnetic memories, the direction of the magnetic field is switched electronically; magneto-optic systems do the switching with light, usually from lasers.
There is nothing new about magneto-optic memories. Some commercial hard-disk drives already exist that use light to read and write information stored in magnetic films. But in these systems the laser switches the magnetic medium by warming it.
Epstein and colleagues’ material contains manganese atoms mixed with small organic molecules, and becomes more magnetic when it absorbs blue light. The light alters the shape of the organic molecules, changing their magnetic properties. The researchers can reverse the effect either by shining green light on the material or by heating it above
In a future memory device, information could be encoded in the material as regions of ’stronger’ or ’weaker’ magnetism, which could be written and erased using tightly focused lasers. This could lead to information storage at very high densities.
Epstein admits that applications of this effect are still a long way off - the organic magnet needs a lot of improvement before it has the properties demanded of commercial devices.
PHILIP BALL | © Nature News Service
Powerful IT security for the car of the future – research alliance develops new approaches
25.05.2018 | Universität Ulm
Supercomputing the emergence of material behavior
18.05.2018 | University of Texas at Austin, Texas Advanced Computing Center
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences