Ferrimagnetic Tb/Co multilayers patterned by ion bombardment as substrates for magnetophoresis.

ABSTRACT: Ion bombardment with 30 keV Ga⁺ ions can locally change the magnetic properties of perpendicular magnetic anisotropy ferrimagnetic Tb/Co based multilayers. The induced changes in the effective magnetization create high gradients of magnetic fields in the proximity of the perimeters of the bombarded areas. Superparamagnetic, micrometer-sized beads floating in an aqueous suspension over such a patterned structure respond to the ensuing magnetostatic energy landscape. This landscape, and its associated forces on the beads, can be controlled with a time varying, external, homogeneous magnetic field. It is shown that with a 3.37 kA/m (approx. 4.2 mT) field and switching the direction at 10 Hz frequencies the beads can be driven with average forward velocities reaching 40  μ m/s. This

SUBMITTER: Urbaniak M 

PROVIDER: S-EPMC11467345 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature