Chinese Academy of Sciences Researchers Engineer Hexagonal SrIrO3 to Achieve Record Efficiency in Magnetic Memory Devices

Chinese researchers achieve record charge-spin conversion in hexagonal SrIrO3, creating a blueprint for ultra-efficient, low-heat magnetic memory devices.

By: AXL Media

Published: Apr 25, 2026, 6:49 AM EDT

Source: Information for this report was sourced from EurekAlert!

Engineering the Future of High-Speed Magnetic Memory

As the global demand for energy-efficient computing and artificial intelligence continues to accelerate, traditional memory technologies are approaching their physical limits. Spin-orbit torque (SOT) technology, which manipulates magnetic moments using electron spin, has emerged as a promising candidate for high-speed and durable magnetic random-access memory (MRAM). However, the high current densities required for data writing have remained a significant barrier, causing excessive heat and power loss. Researchers at the Ningbo Institute of Materials Technology and Engineering (NIMTE) have now addressed this bottleneck by demonstrating a record-breaking charge-spin conversion efficiency in an engineered hexagonal oxide material.

The Shift From Accidental Discovery to Rational Design

The research team, part of the Chinese Academy of Sciences (CAS), departed from the traditional trial-and-error method of material discovery in favor of a "rational design" approach. While previous topological semimetals relied on accidental band inversions, the NIMTE team utilized Crystal Symmetry Engineering to stabilize the compound SrIrO3 in a specific hexagonal phase. By precisely controlling the growth orientation and the substrate, the researchers created a "nonsymmorphic" crystalline symmetry. This symmetry acts as a structural guardian, forcing electron bands to cross in a way that forms robust, 3D topological Dirac points, which are essential for high-performance electronic transport.

Visualizing the Symmetry-Protected Dirac Cones

To confirm the presence of these unique electronic states, the team employed in-situ angle-resolved photoemission spectroscopy (ARPES). This advanced imaging technique allowed researchers to directly observe the bulk Dirac cones and the coexisting spin-momentum locked surface states within the SrIrO3. According to the study published in National Science Review, the synergy between these surface states and the giant Berry curvature in the material's bulk provides the physical foundation for its superior performance. This direct observation validates that the engineered symmetry is the primary driver of the material's advanced spintronic properties.