Phys.org October 2, 2024 A team of researchers in the US (Argonne National Laboratory, University of Chicago) has developed a predictive and general approach to investigate near-field energy transfer processes between localized defects in semiconductors, which couples first-principles electronic structure calculations and a nonrelativistic quantum electrodynamics description of photons in the weak-coupling regime which could be applied to investigate broad classes of defects in solids. They applied their approach to investigate a point defect in an oxide, the F center in MgO, and showed that the energy transfer from a magnetic source to the vacancy could lead to spin nonconserving […]
Category Archives: Data storage
This screen stores and displays encrypted images without electronics
Nanowerk September 17, 2024 While computation functions have been demonstrated in mechanical systems, they rely on compliant mechanisms to achieve predefined states, which impose inherent design restrictions that limit their miniaturization, deployment, reconfigurability, and functionality. Researchers at the University of Michigan describe a metamaterial system based on responsive magnetoactive Janus particle (MAJP) swarms with multiple programmable functions. They designed MAJPs with tunable structure and properties in mind, that is, encoded swarming behavior and fully reversible switching mechanisms, to enable programmable dynamic display, non-volatile and semi-volatile memory, Boolean logic, and information encryption functions in soft, wearable devices. According to the researchers […]
A new metamaterial concept offering the potential for more efficient data storage
Nanowerk July 16, 2024 Researchers in Germany demonstrated that not just individual bits, but entire bit sequences can be stored in cylindrical domains. They used high perpendicular magnetic anisotropy synthetic antiferromagnets in the form of multilayer-based metamaterials whose antiferromagnetic interlayer exchanged energy was purposefully reduced below the out-of-plane demagnetization energy controlling magnetic domain formation. They demonstrated via macroscopic magnetometry and microscopic Lorentz transmission electron microscopy, that it was possible to stabilize nanometer-scale stripe and bubble textures consisting of ferromagnetic out-of-plane domain cores separated by antiferromagnetic in-plane Bloch-type domain walls. According to the researchers this coexistence of mixed ferromagnetic/antiferromagnetic order on […]
Researchers demonstrate solution for long-term challenge, bringing benefits to spintronics and data storage technologies
Phys.org October 30, 2023 Transition-metal oxides (TMOs) with strong ferrimagnetism provide new platforms for tailoring the anomalous Hall effect (AHE) beyond conventional concepts based on ferromagnets, and particularly TMOs with perpendicular magnetic anisotropy (PMA) are of prime importance for today’s spintronics. In this study researchers in Germany reported on transport phenomena and magnetic characteristics of the ferrimagnetic TMO NiCo2O4 (NCO) exhibiting PMA. The entire electrical and magnetic properties of NCO films were strongly correlated with their conductivities governed by the cation valence states. The AHE exhibited an unusual sign reversal resulting from a competition between intrinsic and extrinsic mechanisms depending […]
DNA data storage within reach thanks to new PCR technique
Nanowerk May 4, 2023 For DNA-based storage systems scalable parallel random access to information needs to be robustly established. An international team of researchers (the Netherlands, USA – Microsoft, University of Washington, UK) has developed a thermoconfined polymerase chain reaction, which enabled multiplexed, repeated random access to compartmentalized DNA files. The strategy was based on localizing biotin-functionalized oligonucleotides inside thermoresponsive, semipermeable microcapsules. At low temperatures, microcapsules were permeable to enzymes, primers, and amplified products, whereas at high temperatures, membrane collapse prevented molecular crosstalk during amplification. Their data showed that the platform outperformed non-compartmentalized DNA storage compared with repeated random access […]
Storing information with spins: Creating new structured spin states with spatially structured polarized light
Phys.org March 27, 2023 So far, only uniformly polarized light has been exploited to control electron spins. However, if the polarization has an additional spatial structure it can produce spatially structured electron spins, opening up new ways to store information. Researchers in Japan devised a method for generating spatially structured electron spins using a structured light with spatially varying polarization profile. They transferred spatially variant polarization of topologically structured light to the spatial spin texture in a semiconductor quantum well. The electron spin texture was directly excited by a vector vortex beam with a spatial helicity structure. The spin texture […]
How can digital data stored as DNA be manipulated?
Nanowerk October 20, 2022 An international team of researchers (Japan, France) has pioneered the application of a new method that harnesses enzymes, offering initial clues as to how these technical obstacles may be overcome. They made use of the reactions of three enzymes to design chemical “neurons” that reproduce the network architecture and have the ability for complex calculations exhibited by true neurons. Their chemical neurons can execute calculations with data on DNA strands and express the results as fluorescent signals. They have also innovated by assembling two layers of the artificial neurons to refine calculations. Precision was further enhanced […]
Smart chip senses, stores, computes and secures data in one low-power platform
Nanowerk July 30, 2022 Modern software cryptosystems require extensive computational infrastructure for implementing ciphering algorithms, making them difficult to be adopted by IoT edge sensors that operate with limited hardware resources and at low energy budgets. Researchers at the State University of Pennsylvania proposed and experimentally demonstrated an “all-in-one” 8 × 8 array of robust, low-power, and bio-inspired crypto engines monolithically integrated with IoT edge sensors based on 2D memtransistors. Each engine comprises five 2D memtransistors to accomplish sensing and encoding functionalities. They showed that the ciphered information is secure from an eavesdropper with finite resources and access to deep […]
Building up new data-storage memory
EurekAlert June 11, 2022 Researchers in Japan have developed a proof-of-concept 3D stacked memory cell based on ferroelectric and antiferroelectric FETs with atomic-layer-deposited oxide semiconductor channel. The vertical device structure increases information density and reduces operation energy needs. Hafnium oxide and indium oxide layers were deposited in a vertical trench structure. By using antiferroelectric instead of ferroelectric, they found that only a tiny net charge was required to erase data, which leads to more efficient write operations. This work may allow for new even smaller and more eco-friendly data-storage memory. The team experimented with various thicknesses for the indium oxide […]
The future of data storage is double-helical, research indicates
Science Daily March 3, 2022 A team of researchers in the US (University of Illinois, UMass Amherst, Stanford University) expanded molecular alphabet for DNA data storage comprising four natural and seven chemically modified nucleotides that are readily detected and distinguished using nanopore sequencers. They showed that Mycobacterium smegmatis porin A (MspA) nanopores can accurately discriminate 77 combinations and orderings of chemically diverse monomers within homo- and heterotetrameric sequences. The sequencing accuracy exceeded 60%. The extended molecular alphabet may potentially offer a nearly 2-fold increase in storage density and potentially the same order of reduction in the recording latency, thereby enabling […]