Ivo Utke

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https://people.epfl.ch/113509?lang=fr

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, ,

We show that nanocomposite materials consisting of superparamagnetic nanoparticles embedded in a matrix are very good candidates for a novel generation of Hall nanosensors with high spatial and magnetic resolution, capable of detecting superparamagnetic beads suspended at different heights on top of the sensor. Two detection schemes were used: 1) static-the bead was centered on top of the sensor and detected with a combination of ac and dc orthogonal magnetic fields, and 2) dynamic-using nanomanipulation in an electron microscope for moving the bead precisely at different heights above the sensor and using only one magnetic field (ac). The Hall sensors were directly written by focused-electron-beam-induced deposition and the active area was refined by focused ion beam milling. A magnetic field resolution of about 300 mu T(Hz)(-1/2) and a spatial resolution of 230 nm(Hz)(-1/2) were measured. Both resolutions could be improved by at least an order of magnitude with the suppression of the parasitic inductive signals.

Institute of Electrical and Electronics Engineers2013

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Polarisation stabilisation of vertical cavity surface emitting lasers by minimally invasive focused electron beam triggered chemistry

Andrei Caliman, Vladimir Iakovlev, Martin Jenke, Elyahou Kapon, Alexandru Mereuta, Alexei Sirbu, Ivo Utke

2011

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Granular Co-C nano-Hall sensors by focused-beam-induced deposition

Laurent Bernau, Giovanni Boero, Ivo Utke

We investigated the performance of Hall sensors with different Co-C ratios, deposited directly in nanostructured form, using Co-2(CO)(8) gas molecules, by focused-electron or ion-beam-induced deposition. Due to the enhanced intergrain scattering in these granular wires, the extraordinary Hall effect can be increased by two orders of magnitude with respect to pure Co, up to a magnetic field sensitivity of 1 Omega T-1. We show that the best magnetic field resolution at room temperature is obtained for Co ratios between 60% and 70% and is better than 1 mu T Hz(-1/2). For an active area of the sensor of 200 x 200 nm(2), the room temperature magnetic flux resolution is phi(min) = 2 x 10(phi 0)(-5) in the thermal noise frequency range, i.e. above 100 kHz.

2010

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