Researchers at Carnegie Mellon University have identified an unconventional form of the Hall effect, a foundational principle in physics discovered in 1879. The findings, detailed in Nature Materials, demonstrate that the Hall effect can produce measurable signals when magnetic fields are applied parallel to a material’s surface, contrary to long-standing scientific assumptions that required perpendicular field orientation.
The Hall effect has long been used to study how materials conduct electricity and magnetism. When a magnetic field is applied to a current-carrying material, it deflects moving charges to one side, creating a measurable voltage that reveals information about charge carriers and their mobility. This principle underlies various sensor technologies used in automotive and consumer electronics applications.
The Carnegie Mellon team, working within their Lab for Investigating Quantum Materials, Interfaces and Devices, created ultra-thin devices from tantalum iridium telluride paired with a magnetic layer. By reducing the material to just a few atomic layers and placing it adjacent to a magnetic component, the researchers induced magnetic properties while preserving the base material’s electronic characteristics. The resulting devices demonstrated both conventional and novel Hall signals corresponding to magnetization in different directions.
The practical implications of this discovery could streamline magnetic sensing technology. Previously, detecting magnetic fields in multiple directions required separate sensors. The new devices can measure magnetic fields along multiple axes within a single ultrathin sensor, potentially enabling simpler and more flexible designs for medical imaging, transportation systems, and electronic applications.
Theoretical modeling suggests that the effect arises from reduced symmetry at the interface between the two materials, enabling additional spin-orbit coupling necessary for the in-plane anomalous Hall effect. Researchers are now exploring other material combinations that could produce similar responses and testing device performance at higher temperatures to assess commercial viability.
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