All articles tagged with #magnetism
Researchers used terahertz laser pulses to drive circular lattice vibrations in a crystal and tracked how angular momentum transfers between vibrational modes; during the transfer the rotation can flip direction due to the lattice’s rotational symmetry, offering a direct quantum signature of angular momentum conservation with potential implications for magnetism and ultrafast control of quantum materials.
DTU researchers engineered a compensated ferrimagnet built from chromium and pyrazine in a metal‑organic network that remains internally magnetized while almost entirely canceling its external magnetic field, even above room temperature. This could reduce stray fields that hinder dense electronics and enable closer integration of spin‑based devices, but the technology is still fundamental research and will require studies of electrical properties and thin‑film integration before real‑world use.
Astronomers propose that magnetic fields formed early in a star’s life can survive its evolution, linking magnetic activity observed in red giants to the magnetism seen on white dwarfs via the fossil field theory. Using starquakes (asteroseismology) to probe stellar interiors, they suggest these fossil fields could explain magnetism across evolutionary stages and imply that our Sun’s distant future—swelling into a red giant and eventually becoming a white dwarf—might be influenced by magnetic fields extending into its core. This work could reshape understanding of stellar magnetism and lifespan across the cosmos.
Researchers at the University of Konstanz demonstrate a completely contactless form of friction arising from the collective dynamics of magnetic moments between two layered magnets. By adjusting the gap between layers, they induce competing magnetic orders that cause repeated reorientation during motion, yielding a non-monotonic friction peak at intermediate distances. This dissipation occurs without wear or surface contact, challenging Amontons' law and suggesting tunable, wear-free friction for micro- and nano-scale devices and magnetic bearings.
By studying magnetism in 3.5-billion-year-old rocks from the Pilbara Craton, researchers traced rapid early plate movement—about 24 degrees of latitude in 30 million years and peak speeds near 47 cm/year—indicating an early, segmented lithosphere and challenging stagnant-lid theories about Earth's first tectonics.
New analysis of ancient Moon rocks from the Apollo missions suggests the Moon had a stronger early magnetic field than previously thought, shedding light on the Moon's ancient interior and geophysical history.
Researchers demonstrated optical, non-thermal control of magnetism in a twisted bilayer MoTe2; a laser pulse reversibly flips the ferromagnetic polarity, with switching dynamics tied to whether electrons reside in a topological insulating or metallic state. This links topology and magnetism in a single platform and suggests future possibilities for light-written topological circuits and tiny interferometers on chips.
Physicists used ultracold lithium atoms to simulate the Fermi-Hubbard model in an optical lattice and observed that magnetic correlations persist in a disordered-like regime near the pseudogap, following a single universal pattern tied to a temperature scale similar to the pseudogap temperature. They also detected extended magnetic polarons across many lattice sites, quantified a new 'polaron strength,' and measured high-order spin–charge correlations up to fifth order, indicating the pseudogap hosts complex, multi-particle quantum order that could connect magnetism to high-temperature superconductivity—though some model predictions diverged at higher doping.
Physicists using an ultracold lithium-atom quantum simulator have revealed hidden magnetic order in the pseudogap phase of certain quantum materials, showing universal antiferromagnetic correlations above the superconducting transition and offering fresh insight into how high-temperature superconductivity may emerge, with results published in Proceedings of the National Academy of Sciences.
Scientists at Florida State University have created a new crystalline material with complex swirling magnetic patterns called skyrmion-like spin textures, achieved by combining similar compounds with different crystal symmetries, which could advance data storage and quantum computing technologies.
Physicists have for the first time observed how magnetism is distributed within a radioactive molecule's nucleus, specifically in radium monofluoride, using electrons as probes. This breakthrough allows for more precise studies of nuclear asymmetries that could reveal new physics beyond the Standard Model, and demonstrates the potential of molecules in fundamental physics research.
Researchers from Japan have theoretically demonstrated that shining specific light on magnetic metals can induce non-reciprocal magnetic interactions that effectively violate Newton's third law, leading to a novel chiral phase with persistent rotation, opening new avenues in non-equilibrium materials science and potential technological applications.
In 2000, a famous experiment by Dr. Andre Geim demonstrated how a frog could be levitated using diamagnetism, earning an Ig Nobel Prize; this phenomenon showcases how magnetic fields can make living organisms float without harm, with potential applications in research and industry, and hints at future possibilities like human levitation.
Researchers have demonstrated the electrical switching of altermagnetism in bilayer MnTe, a breakthrough that could lead to new, energy-efficient magnetic memory devices without the need for external magnetic fields, opening new avenues for data storage technology.
MIT physicists have observed a new form of magnetism called 'p-wave magnetism' in nickel iodide, characterized by spiral spin configurations that can be electrically switched, paving the way for more efficient spintronic memory devices.