NextFin news, Researchers at the Hebrew University of Jerusalem, led by Dr. Amir Capua and Benjamin Assouline, announced on November 20, 2025, a seminal breakthrough in the field of photonics and magnetism. Their study, published in Nature's Scientific Reports, reveals that the magnetic component of light—previously considered negligible—actively influences light’s interaction with materials. This overturns a scientific consensus held for nearly two centuries that attributed the Faraday Effect solely to light’s electric field interacting with matter.
The Faraday Effect, first demonstrated by Michael Faraday in 1845, describes how the polarization plane of light rotates when it passes through certain materials subjected to an external magnetic field. Until now, it was widely accepted that this rotation was caused exclusively by the electric field component of light. However, Dr. Capua and Assouline’s application of the Landau-Lifshitz-Gilbert (LLG) equation to magnetic materials—specifically Terbium Gallium Garnet (TGG) crystals—provides theoretical evidence that the oscillating magnetic field of light contributes significantly by exerting magnetic torque within the material.
Their quantitative analysis found the magnetic field is responsible for about 17% of the observed polarization rotation in the visible spectrum and up to 70% in the infrared region. This substantial magnetic contribution refutes the longstanding dismissal of light’s magnetic influence due to assumed weak interaction and spin-misalignment within magnetized materials.
Benjamin Assouline noted, "Our results show that light 'talks' to matter not only through its electric field but also through its magnetic field, a component that has been largely overlooked until now." This novel understanding signifies that light does not merely illuminate materials but exerts a magnetic influence that affects atomic spins and, consequently, their magnetic properties.
According to ScienceDaily, this discovery could catalyze revolutionary advancements across several technological domains. For instance, integrating the magnetic component of light in optical data storage could enhance control over magnetic bits with light, potentially increasing storage density and energy efficiency. In spintronics, leveraging this magnetic interaction enables new mechanisms to manipulate electron spins using light, promising faster and more energy-efficient information processing. Moreover, the findings may accelerate developments in spin-based quantum computing, where precise control of magnetic spins is crucial.
From a broader scientific perspective, this research challenges existing photonics and magnetism paradigms, demanding a revision of theoretical models that have been unaltered since Faraday’s era. Such a paradigm shift may stimulate extensive experimental efforts globally to empirically validate and utilize this magnetic component, thereby energizing multiple research fields including quantum optics, condensed matter physics, and materials science.
Looking ahead, this breakthrough suggests a trend where interdisciplinary approaches combining electromagnetism, quantum mechanics, and advanced material engineering will gain momentum. Industrial applications could emerge rapidly, especially in sectors focused on next-generation computing hardware and high-precision optical devices.
Furthermore, as the frequency dependence of magnetic contribution is significant—being higher in infrared wavelengths—future technologies might target specific optical regimes to maximize magnetic-light interactions. Development of novel materials optimized for this effect, inspired by TGG crystals, could also become a key trend.
This discovery also exemplifies how refined theoretical models, supported by advanced equations like LLG, can overturn long-standing dogma and unlock new scientific horizons. Dr. Amir Capua envisions light-based magnetic manipulation techniques becoming foundational tools in future sensor technologies and information systems.
In summary, this research marks a pivotal moment in understanding light-matter interaction. By unveiling the magnetic secret hidden within light for 180 years, it redefines the foundational physics of the Faraday Effect and sets the stage for technological innovation in optics, spintronics, and quantum computing, reflecting a striking example of how classical science can be rewritten by modern inquiry.
According to ScienceDaily, this advancement stems from meticulous theoretical calculations and models by the Hebrew University team, signaling that experimental validation and industrial application development are imminent next steps in this emerging frontier.
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