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Science Tokyo Details Nanoscale Control Of Magnetic Polarization
Science Tokyo researchers achieved reliable reversal of magnetization in 190 nm structures of BiFe₀.₉Co₀.₁O₃, a multiferroic material offering potential for low-power data storage.
AI reveals the invisible magnetic chaos wasting energy inside electric motors
Electric vehicles are pushing scientists to tackle one of the biggest hidden energy drains inside electric motors: magnetic energy loss. Now, researchers in Japan have developed a powerful AI-driven physics model that can peer into the chaotic “maze-like” magnetic patterns inside motor materials and reveal how heat and microscopic magnetic structures trigger wasted energy.
New study reveals how maze-like magnetic patterns form and evolve in materials
Maze magnetic domains in soft magnetic materials strongly influence energy loss in electric motors, particularly at high temperatures. However, existing models struggle to explain their complex, temperature-dependent behavior. To address this gap, researchers developed an entropy-extended Ginzburg-Landau model combined with data-driven analysis to study these structures. The approach reveals how entropy and energy interactions drive magnetization reversal and increasing domain complexity, providing new insights into magnetic energy-loss mechanisms.
Scientists Just Upended a 300-Year-Old Law of Physics
When load increases steadily, so does friction, but in the realm of magnetization dynamics, things aren’t so simple.
Scientists Just Upended a 300-Year-Old Law of Physics
When load increases steadily, so does friction, but in the realm of magnetization dynamics, things aren’t so simple.
Scientists capture a magnetic flip in 140 trillionths of a second
Scientists at the University of Tokyo have captured something never seen before: a frame-by-frame view of how electron spins flip inside an antiferromagnet, a material once thought to be magnetically “invisible.” By firing ultrafast electrical pulses into a thin layer of manganese–tin and tracking the response with precisely timed flashes of light, the team uncovered two distinct switching mechanisms. One relies on heat generated by strong currents, while the other flips spins directly with minimal heating — a far more efficient process.
A simple discovery is shaking the foundations of spintronics
A long-standing mystery in spintronics has just been shaken up. A strange electrical effect called unusual magnetoresistance shows up almost everywhere scientists look—even in systems where the leading explanation, spin Hall magnetoresistance, shouldn’t work at all. Now, new experiments reveal a far simpler origin: the way electrons scatter at material interfaces under the combined influence of magnetization and an electric field.
Scientists twist tiny crystals to control electricity
Researchers have developed a technique that allows them to carve complex three dimensional nanodevices directly from single crystals. To demonstrate its power, they sculpted microscopic helices from a magnetic material and found that the structures behave like switchable diodes. Electric current prefers one direction, but the effect can be flipped by changing the magnetization or the twist of the helix. The findings show that geometry itself can be used as a tool for electronic design.