Rice University study finds extra turn fixes crystal growth bias
A Rice University-led team published a theoretical strategy to eliminate directional bias when assembling magnetic particles using rotating fields.
Magnetic lag creates preferred direction
Subtle biases in particle interactions can push them toward specific directions during assembly. This effect makes forming uniform crystalline materials difficult at the microscopic scale. The magnetic response of a particle always lags slightly behind the applied field rotation.
Calibrated extra turn solves issue
Researchers found that rotating the field slightly more than one full turn before reversing it removes the bias. This simple adjustment allows particles to assemble into orderly structures without unintended directional preferences. The solution addresses problems caused by magnetic lag during the assembly process.
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