Perovskites are promising as spintronic materials, researchers develop two new perovskite spintronics devices

Researchers from the University of Utah developed two spintronics devices based on perovskite materials. The researchers use these new devices to demonstrate the high potential of perovksites for spintronics systems. This is a followup to the exciting results announced in 2017 by the same group that showed advantages of perovskites for spintronics.

Perovskite spintronics LED wavelength (Utah University)

The researchers use an organic-inorganic hybrid perovskite material that has a heavy lead atom that features strong spin-orbit coupling and a long injected spin lifetime.The first device is a spintronic LED which works with a magnetic electrode instead of an electron-hole electrode. The perovskite LED lights up with circularly polarized electroluminescence.

The EU grants €9.7 million to a six-year Spintronics research project

The European Research Council (ERC) granted a six-year €9.7 million grant to professor Jairo Sinova from Johannes Gutenberg University Mainz (JGU) for its spintronics research. Professor Sinova will collaborate with researchers from the UK and the Czech Republic.

The project is titled "Spin-charge conversion and spin caloritronics at hybrid organic-inorganic interfaces". The researchers hopes that by combining principles of inorganic spintronics with organic materials (polymers) they will achieve better results than if they used purely inorganic systems. The advantages of using polymers include the flexibility of the material, control over the physical properties, and the fact that they are relatively easy to produce.

New Platinum-doped Polymer materials may enable memory Spintronics devices

Researchers from the University of Utah (the same professor whose "Spin Effects in Organic Optoelectronic Devices" talk we just posted on) developed a new platinum-doped polymer that can be used to create light emitting devices, efficient OLEDs and OPVs and perhaps even Spintronics-based memory devices.

The basic idea is to take an organic polymer and insert (dope) platinum atoms at different intervals. Different intervals result in different light colors - including white. So the same molecule can emit different colored light at the same time and thus achieve white light. The researchers created two versions of the same polymer. The Pt-1, which emits violet and yellow light as it has a platinum atom in every unit or link. The Pt-3 has a platinum atom every third unit and it emits blue and orange light. We do not have more information regarding how these materials can be used as Spintronics devices.

University of Utah's Professor Z. Valy Vardeny talks about Organic spintronics

Professor Z. Valy Vardeny from the University of Utah talks about several important developments in the field of organic spintronics and magnetic field effect in organic optoelectronic devices.

Vardeny talks about a spin-OLED that they developed in 2012 using using two FM injecting electrodes, where the electroluminescence depends on the mutual orientation of the electrode magnetization directions. This development has opened up research studies into organic spin-valves in the space-charge limited current regime.

Fullerene used to preserve electron spin over long distances

Researchers from Tohoku University have shown that electron spins can be preserved for long distances using optimized organic compounds. This is because organic compounds are made mostly from carbon, in which the spin–orbit interaction is quite small. Using fullerene (C60) films the researchers made devices in which electrons traveled up to 110 nm at room temperature while preserving their spin.

The researchers used fullerence because there's no hydrogen in it (common in other organic materials) and this helps reduce the hyper fine interactions between electron and nuclear spins that can induce spin-flipping events. They built an organic spin valve in which two ferromagnetic electrons are placed in contact with an organic layer.

Spin-filter effect demonstrated in an organic molecule

Researchers from the University of Arizona and the University of Kaiserslautern demonstrated how organic molecules interact with the magnetic electrode in so-called spintronic devices. Organic Spintronics is interesting because organic semiconductors have several advantages as they can be manufactured cheaply and can be processes at low temperatures.

Spin-filtering image

Using ultra-fast, time-resolved measurements probing the interface between an organic semiconductor and a magnetic metal, the researchers showed that spin controls the time an electron stay trapped in the molecule. This shows that the organic molecule interacts with the magnetic electrode in a spin-dependent way. This is called a spin-filter effect.

Spintronics may lead to brighter and better OLEDs

Researchers from the University of Utah developed a new kind of Spintronics OLED device known as a spin-polarized OLED. This is a light emitting bipolar spin valve which uses a magnetic field to align the spin of the electrons and the electron-holes in the organic materials - causing it to support more current and be brighter.

Spintronics OLED prototype device photo

The researchers hope that in the future it will be possible to control the light color using magnets. This technology also promises to turn OLEDs brighter. It's still about five years away from commercialization - mainly because it requires a very cold (-28F, -33C) temperature currently.

New plastic-based spintronics magnetic field sensor developed, is "dirt cheap"

Researchers from the University of Utah developed a Spintronics organic thin-film transistor that can be used as a cheap magnetic field sensor that never needs to be calibrated and is capable of detecting intermediate to strong magnetic fields. The film also resists heat and degradation and operates at room temperatures.

The thin film is an organic semiconductor polymer called MEH-PPV - a very cheap material. In fact the researchers say that this new sensor is "dirt cheap" - it costs just as little as a drop of regular paint. The researchers are thinking about launching a spin-off company to commercialize this technology.

Buckyballs for Spintronics research granted €1.5 million from the ERC

Researcher Michel de Jong of the NanoElectronics group (MESA+) in the University of Twente (Netherlands) received a €1.5 million grant from the European Research Council to fund his Spintronics work (this is his second ERC grant). Michel de Jong is focusing on organic materials, in particular in Buckyballs (spherical C60 molecules held together by weak bonds) sandwiched between two magnetic materials.

Michel explains that these molecules have very little effect on electron spin, which is a great advantage as it enables them to store spin information for much longer periods of time than silicon. Buckyballs have also been used to create Graphene Quantum Dots.