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An approach based on domain wall displacement in confined ferromagnetic nanostructures for attracting and sensing a single nanometric magnetic particle is presented. We modeled and experimentally demonstrated the viability of the approach using an anisotropic magnetoresistance device made by a micron-sized square ring of Permalloy. This detection concept(More)
Magnetic beads with functionalized surfaces are widely used as molecule carriers or labels for single molecule studies, [1] cell manipulation, [2] and biomagnetic sensing. [3] For this reason manipulation at the nanoscale of surface functionalized magnetic beads in suspension is of paramount importance in biotechnology , nanochemistry, and nanomedicine as(More)
The authors investigate the rectified motion of vortices in superconducting films deposited on top of a close-packed array of open in-plane magnetized triangular micromagnets. The dc voltage induced by the vortex drift under an ac excitation is recorded for three different magnetic configurations of the triangles. When the magnetic elements are in the(More)
The magnetoresistance in submicrometer Permalloy square ring structures has been experimentally measured and modeled. The authors show that using an external field they can place a head-to-head domain wall at a selected corner of the ring and sense its position by magnetoresistance. They finally demonstrate that a domain wall can be reversibly and(More)
Microscale single-layer ferromagnetic rings typically exhibit a magnetic vortex state at remanence, characterized by a flux-closed magnetic state with zero stray fields. Magnetic reversal in such systems yields a vanishing remanent magnetization. In contrast, the authors show that in individual layers in thin rings, which alternate magnetic and nonmagnetic(More)
The geophilomorph centipede, Himantarium gabrielis, when disturbed, discharges a viscous and proteinaceous secretion from the sternal glands. This exudate was found by gas chromatography–mass spectrometry, liquid chromatography–high resolution mass spectrometry, liquid chromatography–mass spectrometry–mass spectrometry and NMR analyses to be composed of(More)
We present a device concept based on controlled micromagnetic configurations in a corner-shaped permalloy nanostructure terminated with two circular disks, specifically designed for the capture and detection of a small number of magnetic beads in suspension. A transverse head-to-head domain wall (TDW) placed at the corner of the structure plays the role of(More)
The vortex dynamics in a low-temperature superconductor deposited on top of a rectangular array of micrometer size permalloy triangles is investigated experimentally. The rectangular unit cell is such that neighboring triangles physically touch each other along one direction. This design stabilizes remanent states which differ from the magnetic vortex state(More)
We investigated the influence of 3-D magnetic layer geometry on switching in magneto-electronic devices. We found that the 3-D topography of magnetic layer must absolutely be taken into consideration during the design phase since their inherent non-planarity profoundly affects their magnetization profile. Our initial results strongly indicate that the(More)
A key issue in fundamental physics and technology is to understand and control the magnetization behaviour of nano-sized magnets. Applications in hard disk drives and magnetic random access memories require nanoscale magnetic elements with controlled magnetic properties to ensure that each element is single domain with magnetization along two stable(More)