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Reorientation Response of Magnetic Microspheres Attached to Gold Electrodes Under an Applied Magnetic Field |
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| Authors: | 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 |
| Affiliation: | 1. Cavendish Laboratory, Department of Physics, University of Cambridge, J.J. Thomson Av., Cambridge, CB3 0HE, UK 2. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan 3. Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife-Pe, Brazil 4. Laboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima, Peru 5. CREST, Japan Science and Technology Agency (JST), 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan |
| 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. |
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