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Tunneling magnetoresistance in altermagnetic RuO₂-based magnetic tunnel junctions

A research team affiliated with UNIST announced the successful development of a novel semiconductor device that uses a new class of materials, known as altermagnetism. This breakthrough is expected to significantly advance the development of ultra-fast, energy-efficient AI semiconductor chips.

Jointly led by Professor Jung-Woo Yoo from the Department of Materials Science and Engineering and Professor Changhee Sohn from the Department of Physics at UNIST, the team succeeded in fabricating (MTJs) using altermagnetic ruthenium oxide (RuO2). They also measured a practical level of tunneling magnetoresistance (TMR) in these devices, demonstrating their potential for spintronic applications.

The research was led by Seunghyun Noh from the Department of Materials Science and Engineering and Kyuhyun Kim from the Department of Physics at UNIST. The findings were published in Physical Review Letters on June 20, 2025.

New microscopy technique achieves 1-nanometer resolution for atomic-scale imaging

Understanding the interaction between light and matter at the smallest scales (angstrom scale) is essential for advancing technology and materials science. Atomic-scale structures, such as defects in diamonds or molecules in electronic devices, can significantly influence a material’s optical properties and functionality. To explore these tiny structures, we need to extend the capabilities of optical microscopy.

Researchers at the Fritz-Haber Institute of the Max-Planck Society, Germany, and their international collaborators at Institute for Molecular Science/SOKENDAI, Japan and CIC nanoGUNE, Spain have developed an approach to scattering-type scanning near-field optical microscopy (s-SNOM) that achieves a spatial resolution of 1 nanometer. This technique, termed as ultralow tip oscillation amplitude s-SNOM (ULA-SNOM), combines advanced microscopy methods to visualize materials at the atomic level.

The work is published in the journal Science Advances.

Cosmic Heavyweights Collide — LIGO Detects Largest, Fastest-Spinning Black Holes Yet

In addition to their high masses, the black holes are also rapidly spinning.

“This is the most massive black hole binary we’ve observed through gravitational waves, and it presents a real challenge to our understanding of black hole formation,” says Mark Hannam of Cardiff University and a member of the LVK Collaboration. “Black holes this massive are forbidden through standard stellar evolution models. One possibility is that the two black holes in this binary formed through earlier mergers of smaller black holes.”

Breaking: Major Antimatter Discovery May Help Solve Mystery of Existence

We’re now a step closer to understanding how the Universe avoided an antimatter apocalypse. CERN scientists have discovered tantalizing clues of a fundamental difference in the way physics handles matter and antimatter.

Experiments at the Large Hadron Collider (LHC) have verified an asymmetry between matter and antimatter forms of a particle called a baryon.

Known as a charge-parity (CP) violation, the effect has only previously been detected in another class of particles, called mesons. But experimental evidence in baryons, which make up the bulk of the Universe’s matter, is something physicists have been long hunting for.

Google sues to disrupt BadBox 2.0 botnet infecting 10 million devices

Google has filed a lawsuit against the anonymous operators of the Android BadBox 2.0 malware botnet, accusing them of running a global ad fraud scheme against the company’s advertising platforms.

The BadBox 2.0 malware botnet is a cybercrime operation that utilizes infected Android Open Source Project (AOSP) devices, including smart TVs, streaming boxes, and other connected devices that lack security protections, such as Google Play Protect.

These devices become infected either by threat actors purchasing low-cost AOSP devices, modifying the operating system to include the BadBox 2 malware, and then reselling them online, or by tricking users into downloading and installing malicious apps on their devices that contain the malware.