Researchers transfer electron spin to photons

An international team, including researchers from CNRS, Université Paris-Saclay, Chinese Academy of Sciences, the University at Buffalo, University of Minnesota, State University of New York and others, recently used electrical pulses to manipulate magnetic information into a polarized light signal, which could revolutionize long-distance optical telecommunications.

The researchers applied an electrical pulse to transfer spin information from electrons to photons, the particles that make up light, allowing the information to be carried great distances at great speed. Their method meets three crucial criteria — operation at room temperature, no need of magnetic field and the ability for electrical control — and opens the door to a range of applications, including ultrafast communication and quantum technologies.

Read the full story Posted: Mar 30,2024

Researchers demonstrate room temperature chirality switching and detection in a helimagnetic thin film

Researchers from Tohoku University and Toho University have demonstrated chirality switching by electric current pulses at room temperature in a thin-film MnAu2 helimagnetic conductor. The team also succeeded in detecting the chirality at zero magnetic fields by means of simple transverse resistance measurement utilizing the spin Berry phase in a bilayer device composed of MnAu2 and a spin Hall material Pt. These results may pave the way to helimagnet-based spintronics. 

Helimagnetic structures, in which the magnetic moments are spirally ordered, host an internal degree of freedom called chirality corresponding to the handedness of the helix. The chirality seems quite robust against disturbances and is therefore promising for next-generation magnetic memory. While the chirality control was recently achieved by the magnetic field sweep with the application of an electric current at low temperature in a conducting helimagnet, problems such as low working temperature and cumbersome control and detection methods have to be solved in practical applications.

Read the full story Posted: Mar 25,2024

Researchers report room-temperature macroscopic ferromagnetism in multilayered graphene oxide

Zhengzhou University researchers have synthesized a new material that combines graphene's remarkable properties with a strong response to magnetic fields. 

Graphene has a long spin lifetime and hyperfine interactions, making it potentially favorable for spintronics applications. Despite the recent discoveries of spin-containing graphene materials, graphene-based materials with room-temperature macroscopic ferromagnetism are extremely rare. In their recent study, room-temperature ferromagnetic amorphous graphene oxide (GO) was synthesized by introducing abundant oxygen-containing functional groups and C defects into single-layered graphene, followed by a self-assembly process under supercritical CO2 (SC CO2). 

Read the full story Posted: Mar 18,2024

Researchers use printed polymer to explore chirality and spin interactions at room temperature

Researchers at North Carolina State University, University of Illinois at Urbana-Champaign, Duke University and Sivananthan Laboratories have relied on a printable organic polymer, that assembles into chiral structures when printed, to reliably measure the amount of charge produced in spin-to-charge conversion within a spintronic material at room temperature. 

The polymer’s tunable qualities and versatility make it desirable not only for less expensive, environmentally friendly, printable electronic applications, but also for use in understanding chirality and spin interactions more generally.

Read the full story Posted: Mar 17,2024

New EU-funded project applies spintronics to the field of artificial intelligence

A new project called MultiSpin.AI was launched in February 2024 and will go on for a period of three years. The project has secured funding totaling more than three million euros from the EIC Pathfinder funding program.

MultiSpin.AI proposes to apply spintronics to the field of artificial intelligence. Processing units will be developed for electrical circuits based on magnetic tunnel junctions. This is a quantum phenomenon that allows electrons to behave in ways not foreseen in classical physics, being able to cross obstacles that, under ‘usual’ conditions, they would not have enough energy to overcome.

Read the full story Posted: Mar 14,2024

Researchers develop model for high-performance spin-wave reservoir computing

Researchers from Tohoku University have developed a theoretical model for high-performance spin wave reservoir computing (RC) that utilizes spintronics technology. This achievement could push scientists closer to realizing energy-efficient, nanoscale computing with unparalleled computational power.

Scientists are constantly striving to create neuromorphic devices that mimic the brain's processing capabilities, low power consumption, and its ability to adapt to neural networks. The development of neuromorphic computing is revolutionary, allowing scientists to explore nanoscale realms, GHz speed, with low energy consumption. In recent years, many advances in computational models inspired by the brain have been made. These artificial neural networks have demonstrated extraordinary performances in various tasks. However, current technologies are software-based; their computational speed, size, and energy consumption remain constrained by the properties of conventional electric computers.

Read the full story Posted: Mar 07,2024

New EU project called 2DSPIN-TECH aims to develop spintronics-based memory devices based on 2D quantum materials

The EU project 2DSPIN-TECH aims to pave the way for significantly faster and more energy-efficient computer memories. Last week, the project kickoff event took place, with seven partners and €4 million in funding. The project spans three years and is conducted within the framework of the EU’s Graphene Flagship, a multibillion-dollar initiative launched over a decade ago to stimulate research and innovation in graphene and other two-dimensional materials.

“Our ambition is to create novel spintronic memory devices based on two-dimensional quantum materials, significantly reducing energy consumption, promoting sustainability, and enhancing the overall performance of computer memories. This is crucial for the future of information technology,” says Saroj Dash, Professor of quantum component physics at Chalmers University of Technology and coordinator of 2DSPIN-TECH.

Read the full story Posted: Mar 03,2024

Researchers manage to realize merons in synthetic antiferromagnets

One way of processing information in spintronics is to use the magnetic vortices called skyrmions or, alternatively, their still little understood and rarer cousins called 'merons'. Both are collective topological structures formed of numerous individual spins. Merons have to date only been observed in natural antiferromagnets, where they are difficult to both analyze and manipulate.

Working in collaboration with teams at Tohoku University in Japan and the ALBA Synchrotron Light Facility in Spain, researchers of Johannes Gutenberg University Mainz (JGU) have been the first to demonstrate the presence of merons in synthetic antiferromagnets and thus in materials that can be produced using standard deposition techniques.

Read the full story Posted: Feb 28,2024

Researchers examine black phosphorus’ potential for spintronics applications

Researchers at Newcastle University, National University of Singapore (NUS) and Japan's National Institute for Materials Science have reported a significant discovery in the field of spintronics based on the unique properties of an ultrathin, two-dimensional material called black phosphorus and how it transports spinning electrons.

Spintronics utilizes the intrinsic spin of electrons to create more energy-efficient devices. Electrons have a spin state of “up” or “down” causing the electrons to act like tiny magnets and manipulating this state has been seen by researchers as crucial for achieving lower power operation in electronic devices. This is because the spin motion of electrons inherently dissipates far less heat than the movement of electrical charge used in traditional electronics. Whilst the phenomenon of spin itself has been widely studied, the challenge has been finding a material with the optimal properties for creating the channels that transport spins.

Read the full story Posted: Feb 24,2024

Researchers show that the magnetic state of antferromagnets can be switched using surface induced strain

Researchers at the Czech Academy of Sciences, Institut Polytechnique de Paris, Vienna Technical University (TU Wien), Charles University, Malvern Panalytical B.V., Nuclear Physics Institute CAS and the European Commission's Joint Research Centre (JRC) recently made an important step that could advance the field of spintronics: they managed to switch the spins in an antiferromagnetic material using surface strain. 

"There are different types of magnetism," explains Sergii Khmelevskyi from the Vienna Scientific Cluster Research Center, Vienna Technical University. "The best known is ferromagnetism. It occurs when the atomic spins in a material are all aligned in parallel. But there is also the opposite, antiferromagnetism. In an antiferromagnetic material, neighboring atoms always have opposite spins." Their effects therefore cancel each other out and no magnetic force can be detected from the outside.

Read the full story Posted: Feb 21,2024