New mechanism converts electrical current vortices into spin currents and vice versa

Researchers from the RIKEN Center for Emergent Matter Science, together with their colleagues, have shown the conversion of a spin current into a rotating charge current vortex using numerical simulations.

This new approach can contribute to the emergence of energy efficient spintronic devices, as it helps to convert between electrical current vortices and a spin current and vice versa. The team came up with the idea of ​​exploiting the Rashba effect – an unusual phenomenon that was discovered in 1959. It occurs on some surfaces or interfaces between two materials where the atomic structure is no longer symmetrical. The Rashba effect causes the spin and the orbital motion of an electron to interact.

Uncovering hidden local states in a quantum material

Scientists have shown evidence of local symmetry breaking in a quantum material upon heating. They believe these local states are associated with electronic orbitals that serve as orbital degeneracy lifting (ODL) "precursors" to the titanium (Ti) dimers (two molecules linked together) formed when the material is cooled to low temperature. Understanding the role of these ODL precursors may offer scientists a path toward designing materials with the desired technologically relevant properties, which typically emerge at low temperatures.

“Not surprisingly, this low-temperature regime is well studied,” said Emil Bozin, a physicist in the X-ray Scattering Group of the Condensed Matter Physics and Materials Science (CMPMS) Division at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory. “Meanwhile, the high-temperature regime remains largely unexplored because it’s associated with relatively high symmetry, which is considered uninteresting.”

Gate-controlled magnetic phase transition in a van der Waals magnet

An international collaboration led by RMIT has achieved record-high electron doping in a layered ferromagnet, causing magnetic phase transition with significant promise for future electronics.

Control of magnetism (or spin directions) by electric voltage is vital for developing future, low-energy high-speed nano-electronic and spintronic devices, such as spin-orbit torque devices and spin field-effect transistors. Ultra-high-charge, doping-induced magnetic phase transition in a layered ferromagnet allows promising applications in antiferromagnetic spintronic devices.

New platform realizes ultra-strong photon-to-magnon coupling

A team of scientists from NUST MISIS and MIPT have developed a new platform for realization of ultra-strong photon-to-magnon coupling. The proposed system is on-chip and is based on thin-film hetero-structures with superconducting, ferromagnetic and insulating layers.

This achievement addresses a problem that has been on the agenda of research teams for the last 10 years, and opens new opportunities in implementing quantum technologies.

Inducing and tuning spin interactions in layered material

A China-Australia collaboration has, for the first time, illustrated that Dzyaloshinskii-Moriya interactions (DMI), an antisymmetric exchange vital for forming various chiral spin textures such as skyrmions, can be induced in a layered material tantalum-sulfide (TaS2) by intercalating iron atoms, and can further be tuned by gate-induced proton intercalation.

Magnetic-spin interactions that allow spin-manipulation by electrical control allow potential applications in energy-efficient spintronic devices.

Researchers find way to control spin waves using light in an insulating material formed by magnetic layers

An international research team, including scientists from the Institute of Molecular Science of the University of Valencia (ICMol), has discovered how to control spin waves using light in an insulating material formed by magnetic layers. This could be a step towards a new generation of devices that store and transport information in a highly efficient way and with very low consumption.

If throwing a stone into a pond generates a wave that propagates over the surface of the water, something similar happens when the action of a magnet or a pulse of light, for example, propagates over a magnetic material – made up of small magnets (spines) connected to each other – and produces what is known as a ‘spin wave’.

Researchers report ultrastrong magnon–magnon coupling dominated by antiresonant interactions

A discovery in the spintronics-based quantum technology field started when slightly misaligned orthoferrite crystals (iron oxide crystals with the addition of one or more rare-earth elements) turned up at a Rice University laboratory.

Rice physicist Junichiro Kono, alumnus Takuma Makihara and their collaborators found an orthoferrite material, in this case yttrium iron oxide, placed in a high magnetic field showed uniquely tunable, ultrastrong interactions between magnons in the crystal. Magnons are quasiparticles, constructs that represent the collective excitation of electron spin in a crystal lattice.

Magnetic graphene could boost generation of spin currents

A team of researchers from The University of Groningen and Columbia University have found that 2D spin-logic devices could benefit from magnetic graphene that can efficiently convert charge to spin current, and can transfer this spin-polarization over long distances.

Graphene is known amongst 2D materials for transporting spin information, but cannot generate spin current unless its properties are modified – conventionally cobalt ferromagnetic electrodes are used for injecting and detecting the spin signal.

Researchers managed to control magnon interaction using a nanoscale switch

Researchers at the University of California, Riverside, have used a nanoscale synthetic antiferromagnet to control the interaction between magnons — research that could lead to faster and more energy-efficient computers.

In ferromagnets, electron spins point in the same direction. To make future computer technologies faster and more energy-efficient, spintronics research employs spin dynamics — fluctuations of the electron spins — to process information. Magnons, the quantum-mechanical units of spin fluctuations, interact with each other, leading to nonlinear features of the spin dynamics. Such nonlinearities play a central role in magnetic memory, spin torque oscillators, and many other spintronic applications.

Researchers create nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

Researchers at Aalto University have developed a new device for spintronics, which could be seen as a step towards using spintronics to make computer chips and devices for data processing and communication technology.

Schematic of the experimental geometry of a new spintronics device imageSchematic of the experimental geometry. Image from article

"If you use spin waves, it's transfer of spin, you don't move charge, so you don't create heating," says Professor Sebastiaan van Dijken, who leads the group that wrote the paper. The device the team made is a Fabry-Pérot resonator, a well-known tool in optics for creating beams of light with a tightly controlled wavelength. The spin-wave version made by the researchers in this work allows them to control and filter waves of spin in devices that are only a few hundreds of nanometres across.