Reorientation Response of Magnetic Microspheres Attached to Gold Electrodes Under an Applied Magnetic Field

L. De Los Santos Valladares, A. Bustamante Dominguez, J. Albino Aguiar, R. M. Reeve, T. Mitrelias, R. M. Langford, Y. Azuma, C. H.W. Barnes, Y. Majima

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In this work, we report the mechanical reorientation of thiolated ferromagnetic microspheres bridging a pair of gold electrodes under an external magnetic field. When an external magnetic field (7 kG) is applied during the measurement of the current-voltage characteristics of a carboxyl ferromagnetic microsphere (4 μm diameter) attached to two gold electrodes by self-assembled monolayers (SAMs) of octane dithiol (C8H18S2), the current signal is distorted. Rather than due to magnetoresistance, this effect is caused by a mechanical reorientation of the ferromagnetic sphere, which alters the number of SAMs between the sphere and the electrodes and therefore affects conduction. To study the physical reorientation of the ferromagnetic particles, we measure their hysteresis loops while suspended in a liquid solution. © 2013 Sociedade Brasileira de Física.
Original languageAmerican English
Pages (from-to)209-213
Number of pages5
JournalBrazilian Journal of Physics
DOIs
StatePublished - 2 Aug 2013

Fingerprint Dive into the research topics of 'Reorientation Response of Magnetic Microspheres Attached to Gold Electrodes Under an Applied Magnetic Field'. Together they form a unique fingerprint.

Cite this