Spintronics News, Resources & Information
Spintronics is the new science of computers and memory chips that are based on electron spin rather than (or in addition to) the charge (used in electronics). Spintronics is an exciting field that holds promise to build faster and more efficient computers and other devices
Albert Fert, recipient of the 2007 Nobel Prize in Physics, gave a lecture a few days ago, titled novel directions for spintronics: spin-orbitronics and magnetic skyrmions:
Researchers from Rice University calculated that imperfections in certain 2D materials create the conditions by which nanoscale magnetic fields arise. According to the researchers this could lead towards new strategies in Spintronics research.
The researchers say that those grain boundaries in 2D semiconducting materials known as dichalcogenides (hybrids that combine transition metal and chalcogen atoms) can be magnetic. The researchers focused on molybdenum disulfide (MDS) grown using CVD. In graphene, the boundaries are weak points, but in dichalcogenides, they have unique properties, and they "squeeze magnetism out of nonmagnetic material".
Researchers from UC Berkeley, Florida International University (FIU) and the Georgia Institute of Technology demonstrated for the first time the presence of magnetic properties in graphene nanostructures at room temperature. This could lead towards Spintronics applications.
To achieve this they functionalized the graphene with nitrophenyl. The researchers thus confirmed the presence of magnetic order in nanoparticle-functionalized graphene. The graphene was epitaxially grown at Georgia Tech, chemically functionalized at UC Riverside and studied at FIU and UC Berkeley.
This book offers an overview of the tremendous potential of organic electronics, concentrating on those emerging topics and technologies that will form the focus of research over the next five to ten years.
The editors brought together internationally renowned authors to review up-and-coming topics, some for the first time, such as organic spintronics, iontronics, light emitting transistors, organic sensors and advanced structural analysis. This book serves the needs of experienced researchers in organic electronics, graduate students and post-doctoral researchers, as well as scientists active in closely related fields, including organic chemical synthesis, thin film growth and biomaterials.
Researchers from UK's London Center of Nanotechnology and Harvard University studied copper pthalocyanine (CuPc) to be used as a spintronics material, and it turns out that this may be a very suitable spintronics material.
The researchers fabricated a thin CuPc film on a substrate. This film contains copper atoms surrounded by nitrogen atoms and rings of carbon. Using a magnetic resonance spectrometer that generates short pulses of microwaves to create a magnetic field that aligned the electron spins. They discovered that electrons retained their spin for a long time - at 5 degrees Kelvin, the spins stayed parallel to the field for 59 milliseconds, and the superposed state lasted 2.6 milliseconds. Raising the temperature decreased those times.
The International Conference on Nanoscale Magnetism 2013 was held at Istanbul Turkey in early September. The organizers published this nice video showing several Spintronics experts explaining what Spintronics is all about and more specifically explain their own research:
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.
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.
Researchers from Korea's RIKEN Center proposed a device that instead of moving electrons is able to transport information using electron spin over long distances. The idea is to sandwich two adjacent thin magnetic films between superconducting layers.
The researchers explain that in conventional superconductors, the electrons are bound together in pairs formed by antiparallel electron spins (this is called a spin-singlet Cooper pair). However, with a ferromagnetic layer nearby, the spin of the two electrons in such a Cooper pair will align itself in the same direction as the magnetic field. So you can move the spin-triplter Cooper pairs from the superconductor into the ferromagnetic layer, where they are very stable and long-lived. The researchers have shown mathematically that within the ferromagnetic layer, those pairs are able to carry spin currents over extended distances of several tens to hundreds of nanometers, and possibly even more (depends on the purity of the magnetic material). In this movement, no hear will be generated.
Researcher from North Carolina State University developed a new material, strontium tin oxide (Sr3SnO) that is a dilute magnetic semiconductors and can be integrated into silicon chips. This means it may be useful for room-temperature Spintronics devices.
The researchers created this material as an epitaxial (single crystal) thin film on a silicon chip. They actually wanted to test whether it is a topological insulator, but surprisingly found out that it has magnetic semiconductor.