Scientists Discover 'Brand New Physics' That Could Revolutionize Energy-Efficient Computing

Researchers have discovered a previously unknown electrical phenomenon called 'anomalous Hall torque' that enables precise control of electron spin, potentially unlocking ultra-energy-efficient computing devices and advancing next-generation electronics.

In a breakthrough that physicists are calling "brand new physics," an international research team has discovered a fundamentally new way to manipulate electron spin through electrical currents—a phenomenon that could unlock the next generation of ultra-energy-efficient computing devices. The discovery, published in the prestigious journal Nature Nanotechnology on January 15, 2025, represents a significant advancement in the field of spintronics and challenges long-standing assumptions about how magnetic materials behave at the quantum level.

The research, led by scientists at the University of Utah and the University of California, Irvine, identifies what the team has dubbed the "anomalous Hall torque"—a previously unknown mechanism that allows for the precise electrical control of spin and magnetization in ferromagnetic materials. This discovery upends decades of conventional wisdom in the field and opens pathways for technologies that were previously considered impractical or impossible.

"This is brand new physics," said Eric Arturo Montoya, lead author of the study, in a statement from the University of Utah. "The anomalous Hall spin current generates a giant spin-orbit torque with unique angular symmetry." The phenomenon occurs when an anomalous Hall spin current within a ferromagnetic conductor creates what researchers describe as "self-generated" spin-orbit torque—a mechanism that operates through principles distinct from those governing previously known spintronic effects.

To understand the significance of this discovery, it is essential to grasp the fundamentals of spintronics. Traditional electronics rely solely on the electrical charge of electrons to process and store information. Spintronic devices, by contrast, exploit both the charge and the intrinsic angular momentum—or "spin"—of electrons. By assigning binary values to electron spin states (typically spin-up representing "0" and spin-down representing "1"), spintronic devices offer the potential for computing platforms that are not only ultra-fast but dramatically more energy-efficient than conventional silicon-based technologies.

The newly discovered anomalous Hall torque operates through a mechanism that was previously overlooked by researchers. When electrical current flows through certain ferromagnetic materials, it generates a spin current through the anomalous Hall effect—a phenomenon first observed over a century ago but whose full implications for spin manipulation were not understood until now. The University of Utah and UC Irvine team demonstrated that this spin current can exert significant torque on the magnetization of the material itself, enabling switching and control without the need for external magnetic fields or complex spin-orbit coupling structures.

"For decades, we've been unable to efficiently control spin in certain material configurations," explained Valy Vardeny, a Distinguished Professor at the University of Utah who was not directly involved in this specific study but has worked on related spintronic breakthroughs. "This discovery removes a fundamental barrier that has limited the practical application of spintronic devices."

The implications of this discovery extend across multiple technological domains. Magnetic Random Access Memory (MRAM), already being commercialized by semiconductor giants including Samsung, Intel, GlobalFoundries, and TSMC, could benefit from simplified device architectures and reduced power consumption. Spin-orbit torque MRAM (SOT-MRAM), which offers faster operation and higher endurance than conventional spin-transfer torque variants, stands to become more practical with the elimination of complex field-free switching mechanisms.

Beyond memory applications, the discovery opens new possibilities for neuromorphic computing—brain-inspired computing architectures that process information more like biological neural networks than traditional von Neumann computers. Spintronic devices are particularly well-suited for neuromorphic applications because they are non-volatile (retaining information without power), highly scalable, and capable of sub-femtojoule switching energies. Recent research has demonstrated that spintronic neuromorphic systems can achieve computational efficiencies of 20 trillion operations per second per watt (TOP/s/w), significantly outperforming conventional AI accelerators.

The timing of this discovery coincides with other major advances in spintronics. In February 2024, researchers experimentally demonstrated the existence of "altermagnetism"—a third form of magnetism distinct from ferromagnetism and antiferromagnetism—which was subsequently named one of Science magazine's top 10 breakthroughs of 2024. Altermagnets exhibit spin splitting without net magnetization, offering unique properties for spintronic applications. Combined with the anomalous Hall torque discovery, these advances are rapidly expanding the toolkit available to engineers designing next-generation electronics.

Industry analysts project significant growth in the spintronics market. According to recent market research, the spintronic materials market is expected to surpass $33.7 billion by 2035, driven by rising adoption of MRAM and energy-efficient memory technologies. Ferromagnetic materials currently dominate with a 45% market share, reflecting their established role in practical devices.

Why it matters

This discovery addresses one of the fundamental challenges limiting spintronic technology: the efficient electrical control of magnetization without excessive power consumption or complex device structures. By revealing a previously hidden mechanism for spin manipulation, researchers have opened a pathway to computing devices that could operate with a fraction of the energy required by current technologies—critical for reducing the environmental impact of data centers and enabling more powerful mobile and edge computing devices.

Background

Spintronics emerged as a field in the 1980s and 1990s with the discovery of giant magnetoresistance, which earned Albert Fert and Peter Grünberg the 2007 Nobel Prize in Physics. The field has since evolved through multiple generations of technology, from simple magnetic read heads to sophisticated magnetic tunnel junctions used in MRAM. However, practical challenges in efficiently injecting, transporting, and manipulating spin currents have limited the technology's widespread adoption. The anomalous Hall torque discovery removes one of these fundamental barriers.

What's next

The research team has already fabricated the first proof-of-concept spintronic devices exploiting the anomalous Hall torque effect. Future work will focus on optimizing material systems for maximum torque efficiency, integrating these devices into practical memory and logic circuits, and exploring hybrid architectures that combine the new effect with other spintronic phenomena. Commercial applications could emerge within 5-10 years, potentially revolutionizing everything from smartphone processors to data center infrastructure.