Researchers classify the spin-orbit effects of holes confined to one dimension quantum wires

Electron 'holes' in semiconductors are very attractive for future spintronics devices due to their unique spin properties, but until now researchers did not have a good understanding of these spin properties. Researchers from Australia's UNSW have classified the spin-orbit effects of holes confined to one dimension for the first time.

Device structure used to research electric field across quantum wire (UNSW)

The researchers started out by trying to explain a 2006 experimental result, that showed that in on-dimensional quantum wires, spin-splitting was extremely sensitive to the direction of the magnetic field, unlike electrons which are insensitive to the field direction. In the recent study, the researchers identified a new spin-orbit interaction factor caused by the holes’ confinement to one dimension, and found that this new factor explained the 2006 experimental result.

Electrical spin control in ultra-low-power transistors enabled though the use of graphene and TMDC

Researchers from the University of York and Roma Tre University developed a method to build ultra-low-power transistors using composite materials based on single layers of graphene and transition metal dichalcogenides (TMDC). These materials can be used to achieve an electrical control over electron spin.

Graphene and TDMCs to enable efficient transistors image

The teams explained “we found this can be achieved with little effort when 2D graphene is paired with certain semiconducting layered materials. Our calculations show that the application of small voltages across the graphene layer induces a net polarization of conduction spins".

Researchers develop a wavelength-selective plasmonic metamaterial absorber on top of a spintronic device

Researchers from Japan's National Institute for Materials Science have developed a wavelength-selective plasmonic metamaterial absorber (PMA) on top of a spintronic device. The researchers say that this design enhances the generation of spin currents from the heat produced in the mid-infrared regime.

Plasmonic Absorber on a Spintronics device (NIMS)

The researchers used a mid-infrared plasmonic metamaterials, combined with a spintronics device for the first time. This unique combination enables stronger light absorption and shows the excellent tenability of these metamaterials' resonance wavelengths

Researchers show how to create spin-valley half-metals

Researchers from Russia and Japan have shown, theoretically, that it is possible to create a new class of materials: spin-valley half-metals. These kind of devices could enable both spintronics valleytronics applications.

Spin-valley half-metal image (MIPT)

In "regular" half-metals, all the electrons that participate in electric currents have the same spin - and so the current is always spin-polarized. These materials have interesting applications for spintronics devices. In the new class of materials now proven theoretically to be possible, there are two valleys present - one providing electrons, one providing holes.

New film material enables to control and detect magnetic skyrmions

Researchers from Singapore's A*STAR and NTU developed a tunable room-temperature platform that can be used to control and detect magnetic skyrmions. This platform is actually a thin film made from multi-layer stacks of Ir/Fe/Co/Pt.

Magnetic skyrmions array (A*STAR)

In this material, the magnetic interactions governing skyrmion properties can be controlled by varying the ferromagnetic layer composition. The skyrmions exhibit a smooth crossover between isolated (metastable) and disordered lattice configurations across samples, while their size and density can be tuned by factors of two and ten, respectively.

Magnetic electrodes used to generate spin current from organic solar panels

Reserachers from Spain's CIC nanoGUNE and IKERBASQUE discovered that you can use organic solar panels to created spin-current. The researchers used cobalt and nickel-iron magnetic electrodes to create spin-polarized current from a solar panel made from C60 fullerenes.

The researchers created the device by evaporating the metal and the C60 fullerenes onto a substrate, replacing the usual indium tin oxide and aluminium electrodes.

EU-funded project announced the first prototypes of nanoporous magnetic memories

The partners in the EU-funded SPIN-PORICS (Merging Nanoporous Materials with Energy-Efficient Spintronics) announced the first prototypes of nanoporous magnetic memories, based on copper and nickel alloys (CuNi).

The project team reported being able to achieve a 35% reduction of magnetic coercivity compared to current devices, which meets the energy consumption required to reorientate the magnetic domains which is necessary for data recording. This result is due to the nanoporous design which enables the whole film - not only the surface - to participate in the electromagnetic effect.