Phys.org July 11, 2019 To reduce energy consumption in magnetic memory devices and improve their speeds, a team of researchers in the US (NIST, University of Colorado, University of Oregon) has developed a method that uses optics through localized surface plasmon resonances to couple light to nanomagnets and produce faster spintronic devices switching speeds and potential lower energy consumption. The method could ultimately lead to memory writing speeds that are 1,000 times faster than current ones…read more. TECHNICAL ARTICLE
Tag Archives: Spintronics
Perfect quantum portal emerges at exotic interface
Nanowerk June 26, 2019 A team of researchers in the US (University of Maryland, UC Irvine) has observed perfect Andreev reflection in point-contact spectroscopy—a clear signature of Klein tunneling and a manifestation of the underlying ‘relativistic’ physics of a proximity-induced superconducting state in a topological Kondo insulator. The findings shed light on a previously overlooked aspect of topological superconductivity and can serve as the basis for a unique family of spintronic and superconducting devices, the interface transport phenomena of which are completely governed by their helical topological states…read more. TECHNICAL ARTICLE
Lasers make magnets behave like fluids
Science Daily April 18, 2019 When a magnet is hit with a short enough laser pulse the spins within a magnet will no longer point just up or down, but in all different directions canceling out the metal’s magnetic properties. Using mathematical modeling, numerical simulations and experiments an international team of researchers (USA – University of Colorado, NIST, SLAC, Temple University, UK, Sweden, U, Italy, Germany, China, Japan, Belgium) has shown that the spins behaved like a superfluid 3 picoseconds after a laser pulse hits and then form small clusters with the same orientation like “droplets” in which the spins […]
Nanoscale pillars as a building block for future information technology
Science Daily October 5, 2018 A key element for future spin-light applications is efficient quantum information transfer at room temperature, but at room temperature the electron spin orientation is nearly randomized. This means that the information encoded in the electron spin is lost or too vague to be reliably converted to its distinct chiral light. Researchers in Sweden have devised an efficient spin-light interface. The key element of the device is extremely small disks of GaNAs, a couple of nanometres high stacked on top of each other with a thin layer of GaAs between to form chimney-shaped nanopillars. Fewer than […]
Research team finds evidence of matter-matter coupling
Phys.org August 23, 2018 An international team of researchers (USA – Rice University, Argonne National Laboratory, Japan, China, Germany) demonstrated that cooperative enhancement of the coupling strength occurs in a magnetic solid in the form of matter-matter interaction. Specifically, the exchange interaction of N paramagnetic erbium(III) (Er3+) spins with an iron(III) (Fe3+) magnon field in erbium orthoferrite (ErFeO3) exhibits a vacuum Rabi splitting whose magnitude is proportional to N. Their results provide a route for understanding, controlling, and predicting novel phases of condensed matter using concepts and tools available in quantum optics. The discovery could help advance the understanding of […]
Topological insulator ‘flips’ for superconductivity
Science Daily April 30, 2018 Using a novel “flip-chip” technique an international team of researchers (USA – University of Illinois, Japan) prepared single-crystalline Bi2Se3 films with predetermined thicknesses in terms of quintuple layers (QLs) on top of Nb substrates fresh from in situ cleavage. Measurements of the film surface disclosed superconducting gaps and coherence peaks of similar magnitude for both the topological surface states and bulk states and revealed key characteristics relevant to the mechanism of coupling between the topological surface states and the superconducting Nb substrate. This new sample preparation method opens many new avenues in research, building a […]
Graphene flakes for future transistors
Science Daily March 14, 2018 Researchers in Italy have demonstrated that hexagonal graphene nanoflakes with zigzag edges display quantum interference. In “Quantum interference transistors” destructive interference would be the “OFF” status. For the “ON” status, they say it is sufficient to remove the conditions for interference. They also demonstrated that magnetism emerges spontaneously at their edges, without any external intervention. This enables the creation of a spin current. The union between the phenomena of quantum interference and of magnetism would allow to obtain almost complete spin polarization, with a huge potential in the field of spintronics. These properties could be […]
Magnon spin currents can be controlled via spin valve structure
Physorg March 15, 2018 In contrast to electrical currents magnon spin currents conduct magnetic momenta. One fundamental building block of magnon spintronics is magnon logic, by which logic operations are processed by the superposition of spin currents. An international team of researchers (Germany, Japan) reports on magnetization orientation-dependent spin current detection signals in collinear magnetic multilayers inspired by the functionality of a conventional spin valve. This yielded a spin valve-like behavior with an amplitude change of 120% in their systems… read more. Open access TECHNICAL ARTICLE