Journal article
Directed Magnetic Particle Transport above Artificial Magnetic Domains Due to Dynamic Magnetic Potential Energy Landscape Transformation



Publication Details
Authors:
Holzinger, D.; Koch, I.; Burgard, S.; Ehresmann, A.
Publication year:
2015
Journal:
ACS Nano
Pages range:
7323-7331
Volume number:
9
Start page:
7323
End page:
7331
ISSN:
1936-0851

Abstract
An approach for a remotely controllable transport of magnetic micro- and/or nanoparticles above a topographically flat exchange-bias (EB) thin film system, magnetically patterned into parallel stripe domains, is presented where the particle manipulation is achieved by sub-mT external magnetic field pulses. Superparamagnetic core–shell particles are moved stepwise by the dynamic transformation of the particles’ magnetic potential energy landscape due to the external magnetic field pulses without affecting the magnetic state of the thin film system. The magnetic particle velocity is adjustable in the range of 1–100 μm/s by the design of the substrate’s magnetic field landscape (MFL), the particle–substrate distance, and the magnitude of the applied external magnetic field pulses. The agglomeration of magnetic particles is avoided by the intrinsic magnetostatic repulsion of particles due to the parallel alignment of the particles’ magnetic moments perpendicular to the transport direction and parallel to the surface normal of the substrate during the particle motion. The transport mechanism is modeled by a quantitative theory based on the precise knowledge of the sample’s MFL and the particle–substrate distance.


Keywords
exchange bias, IBMP, magnetic bead, magnetic field landscape, particle transport, potential energy landscape


Research Areas


Last updated on 2018-01-11 at 13:14