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Sensors 2015, 15(11), 28826-28841; doi:10.3390/s151128826

Hybrid Molecular and Spin Dynamics Simulations for Ensembles of Magnetic Nanoparticles for Magnetoresistive Systems

1
Bielefeld Institute for Applied Materials Research, Computational Materials Science and Engineering, Bielefeld University of Applied Sciences, P.O. 101113, Bielefeld 33511, Germany
2
Center for Spinelectronic Materials and Devices, Department of Physics, Bielefeld University, P.O. 100131, Bielefeld 33501, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Hütten
Received: 28 September 2015 / Revised: 30 October 2015 / Accepted: 6 November 2015 / Published: 13 November 2015
(This article belongs to the Special Issue Magnetic Sensor Device-Part 1)
View Full-Text   |   Download PDF [1598 KB, uploaded 13 November 2015]   |  

Abstract

The development of magnetoresistive sensors based on magnetic nanoparticles which are immersed in conductive gel matrices requires detailed information about the corresponding magnetoresistive properties in order to obtain optimal sensor sensitivities. Here, crucial parameters are the particle concentration, the viscosity of the gel matrix and the particle structure. Experimentally, it is not possible to obtain detailed information about the magnetic microstructure, i.e., orientations of the magnetic moments of the particles that define the magnetoresistive properties, however, by using numerical simulations one can study the magnetic microstructure theoretically, although this requires performing classical spin dynamics and molecular dynamics simulations simultaneously. Here, we present such an approach which allows us to calculate the orientation and the trajectory of every single magnetic nanoparticle. This enables us to study not only the static magnetic microstructure, but also the dynamics of the structuring process in the gel matrix itself. With our hybrid approach, arbitrary sensor configurations can be investigated and their magnetoresistive properties can be optimized. View Full-Text
Keywords: hybrid classical spin dynamics and molecular dynamics simulations; nanoparticular GMR effect hybrid classical spin dynamics and molecular dynamics simulations; nanoparticular GMR effect
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Teich, L.; Schröder, C. Hybrid Molecular and Spin Dynamics Simulations for Ensembles of Magnetic Nanoparticles for Magnetoresistive Systems. Sensors 2015, 15, 28826-28841.

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