EurekAlert December 23, 2019 An international team of researchers (Germany, Switzerland, France) integrated a spin switching functionality into robust complexes, relying on the mechanical movement of an axial ligand strapped to the porphyrin ring. They demonstrated reversible interlocked switching of spin and coordination induced by electron injection on Ag(111) for this class of compounds. The stability of the two spin and coordination states of the molecules exceeds days. The potential applications of this switching concept go beyond the spin functionality and may turn out to be useful for controlling the catalytic activity of surfaces…read more. TECHNICAL ARTICLE
Category Archives: Spintronics
Paving the way for spintronic RAMs: A deeper look into a powerful spin phenomenon
Science Daily December 26, 2019 Extensive studies on Unidirectional spin Hall magnetoresistance (USMR) in metallic bilayers has found that its magnitude (∼10−5) is too small for practical applications. An international team of researchers(Japan,Vietnam) has demonstrated a giant USMR effect in a heterostructure of BiSb topological insulator – GaMnAs ferromagnetic semiconductors. They obtained a large USMR ratio of 1.1% and found that this giant USMR is governed not by the giant magnetoresistance like spin-dependent scattering but by magnon emission/absorption and strong spin-disorder scattering in the GaMnAs layer. Their results present a novel strategy to exploit spin-related phenomena in topological materials, which […]
Toward more efficient computing, with magnetic waves
MIT News November 28, 2019 Classical computers rely on massive amounts of electricity for computing and data storage and generate a lot of wasted heat. MIT researchers developed a circuit architecture that uses only a nanometer-wide domain wall in layered nanofilms of magnetic material to modulate a passing spin wave without any extra components or electrical current. In turn, the spin wave can be tuned to control the location of the wall, as needed. This provides precise control of two changing spin wave states, which correspond to the 1s and 0s used in classical computing. In the future, pairs of […]
Physicists find first possible 3-D quantum spin liquid
Phys.org July 15, 2019 A quantum spin liquid is a state of matter where unpaired electrons’ spins, although entangled, do not show magnetic order even at the zero temperature. An international team of researchers (USA – Rice University, UC San Diego, Oak Ridge National Laboratory, Rutgers University, industry, UK, Switzerland, South Korea, University of Hong Kong) used thermodynamic, muon spin relaxation and neutron scattering experiments on single crystals of Ce2Zr2O7 to demonstrate the absence of magnetic ordering and the presence of a spin excitation continuum at 35 mK. With no evidence of oxygen deficiency and magnetic/non-magnetic ion disorder seen by neutron […]
Unlocking magnetic properties for future faster, low energy spintronics
Nanowerk July 8, 2019 While studying Fe3GeTe2 (FGT) which has promising ferromagnetic properties for spintronic devices, an international team of researchers (Australia, China, South Korea, Russia) discovered magnetoresistance in devices with ferromagnetic van-der-Waals (vdW) materials. They attributed this property to a spin momentum locking induced spin-polarized current at the graphite/FGT interface. The research reveals that ferromagnetic heterostructures assembled from vdW materials can exhibit substantially different properties to those exhibited by similar heterostructures grown in vacuum. Hence, it highlights the potential for new physics and new spintronic applications to be discovered using vdW heterostructures…read more. Open Access TECHNICAL ARTICLE
Ferromagnetic nanoparticle systems show promise for ultrahigh-speed spintronics
Phys.org March 28, 2019 Based on their previous discovery that the “electric field” component of a terahertz pulse plays a key role in the terahertz magnetization modulation of semiconductor-based ferromagnetic materials, researchers in Japan embedded MnAs ferromagnetic nanoparticles in a GaAs host matrix. They observed a large modulation up to 20% of the magnetization of the nanoparticles with terahertz pump pulse irradiation. They found that the modulation is induced by the electric-field component of the terahertz pulse via spin-carrier interactions. The results will lead to an ultrafast coherent magnetization reversal within a picosecond, which will be an essential technique for […]
Sound waves let quantum systems ‘talk’ to one another
Phys.org February 18, 2019 Transferring information between different types of technology, such as quantum memories and quantum processors has been a persistent challenge. To couple the sound waves with the spins of electrons in the material an international team of researchers (University of Chicago, UC Santa Barbara, Argonne National Laboratory, Japan) built a system with curved electrodes to concentrate the sound waves, like using a magnifying lens to focus a point of light. Using the synchrotron they observed inside the material as the sound waves moved through it. The research reveals the importance of shear strain for future device engineering […]
Overtones can provide faster data communication
Phys.org January 10, 2019 An international team of researchers (Sweden, Portugal) demonstrated how to play and strengthen overtones at the nano level. The researchers have produced spintronic oscillators that strengthen spin wave signals in several steps. When they increased the drive current, the signal showed a sharp jump in frequency: first, from the fundamental frequency of 9 GHz to 14 GHz and then a second jump to 20 GHz. While the wavelength of the fundamental tone is about 500 nanometres, the wavelength of the demonstrated third overtone is as short as 74 nanometres. Future studies on smaller oscillators should be […]
Hybrid qubits solve key hurdle to quantum computing
Phys.org December 28, 2018 Single-spin qubits in semiconductor quantum dots hold promise for universal quantum computation. However, initialization and readout of a qubit is orders of magnitude slower than control. An international team of researchers (Japan, France, Germany, Switzerland) combined slow initializing single-spin qubit called a Loss-DiVincenzo qubit, which has very high control fidelity and a singlet-triplet qubit, which has quick initialization and read out, but quickly becomes decoherent. For the study they combined the two types with a type of quantum gate known as a controlled phase gate, which allowed spin states to be entangled between the qubits in […]
Electronics of the future: A new energy-efficient mechanism using the Rashba effect
Science Daily December 27, 2018 Researchers in Japan using the Rashba effect for generating spin currents in material structures that possess electrons with desirable spin properties. They developed a mechanism to generate a spin current without energy loss from a series of simulations for new quasi-1D materials based on bismuth-adsorbed indium that exhibit a giant Rashba effect. This mechanism does not require an external magnetic field to generate nondissipative spin current. The process would simplify potential spintronic devices and would allow for further miniaturization… read more. Open Access TECHNICAL ARTICLE