Spintronics-Info: the spintronics experts

Spintronics-Info is a news hub and knowledge center born out of keen interest in spintronic technologies.

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.

Recent Spintronic News

Researchers present new approach to create and stabilize complex spin textures

Spins can form complex magnetic structures within the nanometer and micrometer scale in which the magnetization direction twists along specific directions. Examples of such structures are magnetic bubbles, skyrmions, and magnetic vortices. Spintronics aims to make use of such tiny magnetic structures to store data or perform logic operations with very low power consumption compared to today's dominant microelectronic components. However, the generation and stabilization of most of these magnetic textures is restricted to a few materials and achievable under very specific conditions (temperature, magnetic field, etc.).

An international collaboration led by Helmholtz-Zentrum Berlin (HZB) has presented a new approach that can be used to create and stabilize complex spin textures, such as radial vortices, in a variety of compounds. In a radial vortex, the magnetization points towards or away from the center of the structure. This type of magnetic configuration is usually highly unstable. Within this novel approach, radial vortices are created with the help of superconducting structures, while the presence of surface defects achieves their stabilization.

Read the full story Posted: Apr 23,2024

Researchers develop imaging technique for visualization of spin-polarized electronic states

Researchers at Japan's National Institute for Materials Science have developed an improved type of microscope that can visualize key aspects of electron spin states in materials. The quantum mechanical property of electrons called spin is more complex than the spin of objects in our everyday world but is related to it as a measure of an electron’s angular momentum. The spin states of electrons can have a significant impact on the electronic and magnetic behavior of the materials they are part of.

The technology, developed by Koichiro Yaji and Shunsuke Tsuda, is known as imaging-type spin-resolved photoemission microscopy (iSPEM). It uses the interaction of light with the electrons in a material to detect the relative alignment of the electron spins. It is particularly focused on electron spin polarization – the extent to which electron spins are collectively aligned in a specific direction.

Read the full story Posted: Apr 17,2024

Researchers tackle key obstacles to bringing 2D magnetic materials into practical use

Researchers at MIT have tackled key obstacles to bringing 2D magnetic materials into practical use. The team designed a “van der Waals atomically layered heterostructure” device where a 2D van der Waals magnet, iron gallium telluride, is interfaced with another 2D material, tungsten ditelluride. The team shows that the magnet can be toggled between the 0 and 1 states simply by applying pulses of electrical current across their two-layer device. 

Use of magnetic materials to build computing devices like memories and processors has emerged as a promising avenue for creating “beyond-CMOS” computers, which would use far less energy compared to traditional computers. Magnetization switching in magnets can be used in computation the same way that a transistor switches from open or closed to represent the 0s and 1s of binary code. While much of the research along this direction has focused on using bulk magnetic materials, a new class of magnetic materials — called two-dimensional van der Waals magnets — provides superior properties that can improve the scalability and energy efficiency of magnetic devices to make them commercially viable.

Read the full story Posted: Apr 08,2024

Researchers spot homochiral antiferromagnetic merons, antimerons and bimerons in synthetic antiferromagnets

Researchers from Johannes Gutenberg-University Mainz, ALBA Synchrotron Light Facility and Tohoku University have identified quasiparticles called merons in a synthetic antiferromagnet for the first time, which could lead to new concepts for spintronics devices.

The spintronics field is still rather nascent as research is ongoing. Recent research has focused on structures called skyrmions as potential building blocks. These structures are quasiparticles made up of numerous electron spins and can be thought of as two-dimensional whirls (or “spin textures”) within a material. Skyrmions exist in many magnetic materials, including cobalt–iron–silicon and the manganese–silicide thin films in which they were first discovered. They are attractive spintronics candidates because they are robust to external perturbations, making them particularly stable for storing and processing the information they contain. At just tens of nanometres across, they are also much smaller than the magnetic domains used to encode data in today’s disk drives, making them ideal for future data storage technologies such as “racetrack” memories. Like skyrmions, merons are made up of numerous individual spins. Unlike them, their stray magnetic fields are miniscule, which would facilitate ultrafast operations and even higher information storage densities within a device. Until now, however, merons have only been observed in natural antiferromagnets, where they have proved difficult to analyze and manipulate.

Read the full story Posted: Apr 05,2024

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