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Date
2020-10-15Subject
550 Earth sciences and geology 600 Technology MikrosystemtechnikMikromagnetismusParamagnetismusSimulationLab on a ChipMetadata
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Aufsatz
Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels
Abstract
We present a numerical investigation on the detection of superparamagnetic labels using a giant magnetoresistance (GMR) vortex structure. For this purpose, the Landau–Lifshitz–Gilbert equation was solved numerically applying an external z-field for the activation of the superparamagnetic label. Initially, the free layer’s magnetization change due to the stray field of the label is simulated. The electric response of the GMR sensor is calculated by applying a self-consistent spin-diffusion model to the precomputed magnetization configurations. It is shown that the soft-magnetic free layer reacts on the stray field of the label by shifting the magnetic vortex orthogonally to the shift direction of the label. As a consequence, the electric potential of the GMR sensor changes significantly for label shifts parallel or antiparallel to the pinning of the fixed layer. Depending on the label size and its distance to the sensor, the GMR sensor responds, changing the electric potential from 26.6 mV to 28.3 mV.
Citation
In: sensors Volume 20 / Issue 20 (2020-10-15) EISSN 1424-8220Sponsorship
Gefördert durch den Publikationsfonds der Universität KasselCitation
@article{doi:10.17170/kobra-202011162175,
author={Wetterau, Lukas and Abert, Claas and Suess, Dieter and Albrecht, Manfred and Witzigmann, Bernd},
title={Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels},
journal={sensors},
year={2020}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2020$n2020 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/11982 3000 Wetterau, Lukas 3010 Abert, Claas 3010 Suess, Dieter 3010 Albrecht, Manfred 3010 Witzigmann, Bernd 4000 Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels / Wetterau, Lukas 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/11982=x R 4204 \$dAufsatz 4170 5550 {{Mikrosystemtechnik}} 5550 {{Mikromagnetismus}} 5550 {{Paramagnetismus}} 5550 {{Simulation}} 5550 {{Lab on a Chip}} 7136 ##0##http://hdl.handle.net/123456789/11982
2020-11-16T12:45:43Z 2020-11-16T12:45:43Z 2020-10-15 doi:10.17170/kobra-202011162175 http://hdl.handle.net/123456789/11982 Gefördert durch den Publikationsfonds der Universität Kassel eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ micromagnetic simulations superparamagnetic labels vortex structures giant magnetoresistance lab-on-a-chip device 550 600 Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels Aufsatz We present a numerical investigation on the detection of superparamagnetic labels using a giant magnetoresistance (GMR) vortex structure. For this purpose, the Landau–Lifshitz–Gilbert equation was solved numerically applying an external z-field for the activation of the superparamagnetic label. Initially, the free layer’s magnetization change due to the stray field of the label is simulated. The electric response of the GMR sensor is calculated by applying a self-consistent spin-diffusion model to the precomputed magnetization configurations. It is shown that the soft-magnetic free layer reacts on the stray field of the label by shifting the magnetic vortex orthogonally to the shift direction of the label. As a consequence, the electric potential of the GMR sensor changes significantly for label shifts parallel or antiparallel to the pinning of the fixed layer. Depending on the label size and its distance to the sensor, the GMR sensor responds, changing the electric potential from 26.6 mV to 28.3 mV. open access Wetterau, Lukas Abert, Claas Suess, Dieter Albrecht, Manfred Witzigmann, Bernd doi:10.3390/s20205819 Mikrosystemtechnik Mikromagnetismus Paramagnetismus Simulation Lab on a Chip publishedVersion EISSN 1424-8220 Issue 20 sensors Volume 20 false 5819
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