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Keywords = granular GMR

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44 pages, 11560 KiB  
Review
Correlation of Crystalline Structure with Magnetic and Transport Properties of Glass-Coated Microwires
by Arcady Zhukov, Mihail Ipatov, Ahmed Talaat, Juan Maria Blanco, Blanca Hernando, Lorena Gonzalez-Legarreta, Joan Josep Suñol and Valentina Zhukova
Crystals 2017, 7(2), 41; https://doi.org/10.3390/cryst7020041 - 8 Feb 2017
Cited by 70 | Viewed by 8478
Abstract
We overviewed the correlation between the structure, magnetic and transport properties of magnetic microwires prepared by the Taylor-Ulitovsky method involving rapid quenching from the melt and drawing of the composite (metallic core, glass coated) wire. We showed that this method can be useful [...] Read more.
We overviewed the correlation between the structure, magnetic and transport properties of magnetic microwires prepared by the Taylor-Ulitovsky method involving rapid quenching from the melt and drawing of the composite (metallic core, glass coated) wire. We showed that this method can be useful for the preparation of different families of magnetic microwires: soft magnetic microwires displaying Giant magnetoimpedance (GMI) effect, semi-hard magnetic microwires, microwires with granular structure exhibiting Giant Magnetoresistance (GMR) effect and Heusler-type microwires. Magnetic and transport properties of magnetic microwires depend on the chemical composition of metallic nucleus and on the structural features (grain size, precipitating phases) of prepared microwires. In all families of crystalline microwires, their structure, magnetic and transport properties are affected by internal stresses induced by the glass coating, depending on the quenching rate. Therefore, properties of glass-coated microwires are considerably different from conventional bulk crystalline alloys. Full article
(This article belongs to the Special Issue Advance in Crystalline Thin Wires)
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24 pages, 7323 KiB  
Review
Giant Magnetoresistance: Basic Concepts, Microstructure, Magnetic Interactions and Applications
by Inga Ennen, Daniel Kappe, Thomas Rempel, Claudia Glenske and Andreas Hütten
Sensors 2016, 16(6), 904; https://doi.org/10.3390/s16060904 - 17 Jun 2016
Cited by 153 | Viewed by 23409
Abstract
The giant magnetoresistance (GMR) effect is a very basic phenomenon that occurs in magnetic materials ranging from nanoparticles over multilayered thin films to permanent magnets. In this contribution, we first focus on the links between effect characteristic and underlying microstructure. Thereafter, we discuss [...] Read more.
The giant magnetoresistance (GMR) effect is a very basic phenomenon that occurs in magnetic materials ranging from nanoparticles over multilayered thin films to permanent magnets. In this contribution, we first focus on the links between effect characteristic and underlying microstructure. Thereafter, we discuss design criteria for GMR-sensor applications covering automotive, biosensors as well as nanoparticular sensors. Full article
(This article belongs to the Special Issue Giant Magnetoresistive Sensors)
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14 pages, 553 KiB  
Review
Lab-on-a-Chip Magneto-Immunoassays: How to Ensure Contact between Superparamagnetic Beads and the Sensor Surface
by Bernhard Eickenberg, Judith Meyer, Lars Helmich, Daniel Kappe, Alexander Auge, Alexander Weddemann, Frank Wittbracht and Andreas Hütten
Biosensors 2013, 3(3), 327-340; https://doi.org/10.3390/bios3030327 - 17 Sep 2013
Cited by 12 | Viewed by 10656
Abstract
Lab-on-a-chip immuno assays utilizing superparamagnetic beads as labels suffer from the fact that the majority of beads pass the sensing area without contacting the sensor surface. Different solutions, employing magnetic forces, ultrasonic standing waves, or hydrodynamic effects have been found over the past [...] Read more.
Lab-on-a-chip immuno assays utilizing superparamagnetic beads as labels suffer from the fact that the majority of beads pass the sensing area without contacting the sensor surface. Different solutions, employing magnetic forces, ultrasonic standing waves, or hydrodynamic effects have been found over the past decades. The first category uses magnetic forces, created by on-chip conducting lines to attract beads towards the sensor surface. Modifications of the magnetic landscape allow for additional transport and separation of different bead species. The hydrodynamic approach uses changes in the channel geometry to enhance the capture volume. In acoustofluidics, ultrasonic standing waves force µm-sized particles onto a surface through radiation forces. As these approaches have their disadvantages, a new sensor concept that circumvents these problems is suggested. This concept is based on the granular giant magnetoresistance (GMR) effect that can be found in gels containing magnetic nanoparticles. The proposed design could be realized in the shape of paper-based test strips printed with gel-based GMR sensors. Full article
(This article belongs to the Special Issue Nanomaterials for Biodetection and Drug Delivery)
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