Author: Manuel Vázquez, ICMM
When: June, 4 - 12PM
Where: Salón de Actos, ICMM
Abstract: Research on curvature effects in magnetic nanostructures is attracting much interest as they offer novel alternatives to planar systems. In particular, the cylindrical geometry introduces significant singularities in the magnetic response of ferromagnetic wires just from their curvature, which primarily depends on their diameter, length, and aspect ratio. The main magnetic configurations include axial, transverse, and vortex (circular with a singularity at the axis). Microwires, 1 to 200 micrometer diameter, are fabricated by in-rotating-water and by quenching and drawing ultrarapid solidification techniques. Amorphous wires with high magnetostriction re-magnetize through an ideal millimeter-long single domain wall propagating at kilometer-per-second speeds that results in a square hysteresis loop. Such bistable behavior and their magnetoelastic properties are the basis for various devices (e.g., field, stress and temperature sensors, electromagnetic shielding).
