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. 2022 Nov 4;15(21):7781. doi: 10.3390/ma15217781

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Stages in the formation of arrays of rolled-up semiconductor and polymer 3D shells. The rolling of strained films in a tube scroll occurs after their separation from the substrate by selective liquid etching [13]. (b) Schematic representation of a rolled-up multilayer GMR sensor for the in-flow detection of magnetic objects inside a microfluidic channel [124]. Copyright 2011, American Chemical Society. (c) Domain structure in bent cylindrical films. Reproduced from [121], © IOP Publishing. Ltd. All rights reserved. Top row: circular magnetization without a longitudinal component (azimuthal) and with a longitudinal component (helical). Bottom row: radial and longitudinal magnetization. (d) Tracking the trajectory in magnetic field of a rolled-up magnetic coil with in-plane magnetization [125].