Researchers report a new type of magnetism called altermagnetism

Researchers have conducted experiments at the Swiss Light Source SLS that resulted in proof of the existence of a new type of magnetism: altermagnetism. The experimental discovery of this new branch of magnetism could signify new fundamental physics, with major implications for spintronics.

Since the discovery of antiferromagnets nearly a century ago, the family of magnetic materials has been divided into two fundamental phases: the ferromagnetic branch known for several millennia and the antiferromagnetic branch. The experimental proof of a third branch of magnetism, termed altermagnetism, was made by an international collaboration led by the Czech Academy of Sciences together with Paul Scherrer Institute PSI. The fundamental magnetic phases are defined by the specific spontaneous arrangements of magnetic moments—or electron spins—and of atoms that carry the moments in crystals.

Read the full story Posted: Feb 16,2024

Researchers identify a new state of matter with Chiral Currents

An international team of researchers has identified a novel state of matter, distinguished by chiral currents at the atomic level. This discovery challenges traditional understandings of magnetic materials and opens up new doors for quantum material applications.

Chirality, a property indicating that a structure cannot be superimposed onto its mirror image, is crucial across various scientific fields, notably in understanding DNA's structure. The research group, led by Federico Mazzola from Ca' Foscari University of Venice, observed these chiral currents through interactions between light and matter. Specifically, they demonstrated that electrons could be ejected from a material's surface with a distinct spin state by employing suitably polarized photons.

Read the full story Posted: Feb 12,2024

Researchers develop spin-selective memtransistors with magnetized graphene

An interdisciplinary collaboration of researchers from South Korea and Singapore recently reported a significant advance towards achieving spin-polarized van der Waals heterostructures. The team designed a spin-selective memtransistor device using single-layer graphene deposited on the antiferromagnetic van der Waals magnetic insulator CrI3

Transport measurements combined with first-principles calculations provide unprecedented insights into tailoring reciprocal magnetic proximity interactions to generate and probe proximitized magnetism in graphene at room temperature.

Read the full story Posted: Feb 08,2024

Researchers examine new ways to excite spin waves with infrared light

Researchers have devised a new ultrafast method for controlling magnetic materials, that may enable next-generation information processing technologies.

A possible solution for building faster systems for processing is to use patterns of electron spins, called spin waves, to transfer and process information much more rapidly than in conventional computers. So far, a major challenge has been in manipulating these ultrafast spin waves to do useful work. Announcing a significant step forward, researchers from The University of Texas at Austin and MIT have developed a method to precisely manipulate these ultrafast spin waves using tailored light pulses. Their findings are detailed in two studies in Nature Physics, led by MIT graduate student Zhuquan Zhang, University of Texas at Austin postdoctoral researcher Frank Gao, MIT’s professor of chemistry Keith Nelson and UT Austin assistant professor of physics Edoardo Baldini.

Read the full story Posted: Feb 01,2024

Researchers uncover the remarkable anisotropic spin transport of ultrathin black phosphorus

Researchers at Newcastle University, National University of Singapore (NUS) and Japan's National Institute for Materials Science have reported on the highly anisotropic spin transport nature of two-dimensional black phosphorus.

In contrast to the conventional movement of charge in electronic devices, spintronics focuses on pioneering devices that manipulate the intrinsic property of electrons known as "spin." Similar to charges in electrons, spin gives electrons a rotational quality like they are rotating around an axis, making them behave like tiny magnets, which have both a magnitude and a direction. The electron spin can exist in one of two states, referred to as spin "up" or spin "down." This is analogous to clockwise or anticlockwise rotation. While traditional electronic devices work by moving charges around the circuit, spintronics operates by manipulating the electron spin. This is important because moving electrical charges around traditional electric circuits necessarily causes some power to be lost as heat, whereas the motion of spin does not intrinsically dissipate as much heat. This characteristic could potentially allow for lower-power device operation.

Read the full story Posted: Jan 21,2024

Researchers find way to detect higher-order topological insulators

Higher-order topological insulators, or HOTIs, have attracted attention for their ability to conduct electricity along one-dimensional lines on their surfaces, but this property is quite difficult to experimentally distinguish from other effects. 

By instead studying the interiors of these materials from a different perspective, a team of researchers at the University of Illinois at Urbana-Champaign, Dublin Institute for Advanced Studies, Chinese Academy of Sciences and additional collaborators has identified a surface signature that is unique to HOTIs that can determine how light reflects from their surfaces. 

Read the full story Posted: Jan 20,2024

Researchers show how ultrafast lasers could advance energy-efficient data storage

Researchers at the National Synchrotron Light Source II at Brookhaven National Laboratory, University of California Davis, University of Colorado Springs, Stockholm University, National Institute of Standards and Technology, University of California San Diego, Ca’ Foscari University of Venice, and Elettra Sincrotrone Trieste have conducted an experiment with magnetic materials and ultrafast lasers that could advance energy-efficient data storage.

"We wanted to study the physics of light-magnet interaction," said Rahul Jangid, who led the data analysis for the project while earning his Ph.D. in materials science and engineering at UC Davis under associate professor Roopali Kukreja. "What happens when you hit a magnetic domain with very short pulses of laser light?"

Read the full story Posted: Jan 18,2024

Researchers use heat to drive topological spin texture transformations

Researchers at Japan's RIKEN have conducted an experiment that could help the development of new energy-efficient spintronics devices. They used heat and magnetic fields to create transformations between spin textures—magnetic vortices and antivortices known as skyrmions and antiskyrmions—in a single crystal thin plate device. What's even more important is that they achieved this at room temperature.

Skyrmions and antiskyrmions, which are textures that exist within special magnetic materials involving the spin of the electrons in the material, are an active area of research, as they could be used for next-generation memory devices, for example, with skyrmions acting as a "1" bit and antiskyrmions a "0" bit. In the past, scientists have been able to move them in a variety of ways, and to create transformations between them using electric current. However, because current electronic devices consume electrical power and produce waste heat, the researchers in the group, led by Xiuzhen Yu at the RIKEN Center for Emergent Matter Science, decided to see if they could find a way to create the transformations using heat gradients.

Read the full story Posted: Jan 13,2024

Researchers demonstrate strain-induced orbital control in an interfacial multiferroic material

A Japanese research team, led by Jun Okabayashi from the University of Tokyo, including Associate Professor Yoshihiro Gohda from Tokyo Tech and Osaka University researchers, recently revealed a strain-induced orbital control mechanism in interfacial multiferroics. 

Controlling the direction of magnetization using low electric field is important for achieving efficient spintronic devices. In spintronics, properties of an electron's spin or magnetic moment are used to store information. The electron spins can be manipulated by straining orbital magnetic moments to create a high-performance magnetoelectric effect.

Read the full story Posted: Jan 12,2024