Science Daily April 1, 2019 Reconfigurable, ordered matter offers great potential for future low-power computer memory by storing information in energetically stable configurations. An international team of researchers (UK, USA – University of Colorado) describe stable, high-degree multi-skyrmion configurations where an arbitrary number of antiskyrmions are contained within a larger skyrmion called skyrmion bags. They have demonstrated the concept experimentally and numerically in liquid crystals and numerically in micromagnetic simulations either without or with magnetostatic effects. They found the skyrmion bags to act like single skyrmions in pairwise interaction and under the influence of current in magnetic materials. The finding […]
Tag Archives: Data storage
Future information technologies: Nanoscale heat transport under the microscope
Science Daily August 21, 2018 An international team of researchers (Germany, USA – MIT, France) examined heat transport in a metallic-magnetic model system. Their model system consists of a nanometre-thin ferromagnetic nickel layer (12.4 nm) applied to a magnesium oxide substrate, with an even thinner layer of gold (5.6 nm) deposited over the nickel. They introduced heat locally into the model system. They found that the model system does not take the roughly one picosecond to reach thermal equilibrium as expected, but instead a hundred times longer. According to the researchers future data memories based on heat-assisted magnetic recording techniques […]
Physicists show that is impossible to mask quantum information in correlations
Phys.org June 21 2018 Classical information encoded in composite quantum states can be completely hidden from the reduced subsystems and may be found only in the correlations. An international team of researchers (Australia, India) has shown that while this may still be true for some restricted sets of nonorthogonal quantum states, it is not possible for arbitrary quantum states. This result suggests that quantum qubit commitment—a stronger version of the quantum bit commitment—is not possible in general. The findings may have potential applications in secret sharing and future quantum communication protocols…read more. TECHNICAL ARTICLE
Scientists find ordered magnetic patterns in disordered magnetic material
Science Daily June 8, 2018 A team of researchers in the US (Lawrence Berkeley National Laboratory, UC Berkeley) has generalized the concept of chirality driven by interfacial the Dzyaloshinskii–Moriya interaction (DMI) to complex multicomponent systems and demonstrated on the example of chiral ferrimagnetism in amorphous GdCo films. They found that 2 nm thick GdCo films preserve ferrimagnetism and stabilize chiral domain walls. The type of chiral domain walls depends on the rare‐earth composition/saturation magnetization. The success of the experiments opens the possibility of controlling some properties of domain walls, such as chirality, with temperature, and of switching a material’s chiral […]