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Giovanni Boero

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Publications associées (86)

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

Giovanni Boero, Ivo Utke, Laurent Bernau

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 g ...

2010

A Low-Noise CMOS Receiver Frontend for NMR-based Surgical Guidance

Giovanni Boero, Jens Anders

In this paper a novel architecture for an integrated NMR receiver front-end for surgical guidance applications is described. While the chip consumes only 9 mA supply current from a 3.3 V power supply it has a measured input referred noise density of 0.7 nV ...

Springer, 233 Spring Street, New York, Ny 10013, United States2009

An Integrated CMOS Receiver Chip for NMR-Applications

Giovanni Boero, Jens Anders, Paul Sangiorgio

We present the first CMOS-only receiver chip for NMR-applications at 300 MHz. The system consists of an on-chip reception coil, a tuning-capacitor, a downconversion-mixer and a low-frequency gain-stage as well as biasing and offset-compensation circuitry. ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics

Giovanni Boero, Pietro Gambardella, Stefano Rusponi

We show that double-resonance spectra recorded during the simultaneous absorption of x-ray and microwave (MW) photons are a fingerprint of the perturbed electronic configuration of atomic species driven to ferromagnetic resonance. X-ray absorption measurem ...

2009

A single-chip array of NMR receivers

Giovanni Boero, Jens Anders, Paul Sangiorgio

We present the first single-chip array of integrated NMR receivers for parallel spectroscopy and imaging. The array, optimized for operation at 300 MHz, is composed of eight separate channels, with each channel consisting of a detection coil, a tuning capa ...

Academic Press Inc - Elsevier Science2009

Longitudinal detection of ferromagnetic resonance using x-ray transmission measurements

Giovanni Boero, Pietro Gambardella, Stefano Rusponi

We describe a setup for the x-ray detection of ferromagnetic resonance in the longitudinal geometry using element-specific transmission measurements. Thin magnetic film samples are placed in a static magnetic field collinear with the propagation direction ...

American Institute of Physics2009

Element-resolved x-ray ferrimagnetic and ferromagnetic resonance spectroscopy

Giovanni Boero, Pietro Gambardella, Stefano Rusponi, Schahrazede-Lila Mouaziz

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2008

Electron counting at room temperature in an avalanche bipolar transistor

Radivoje Popovic, Giovanni Boero, Marc Lany

We report on real-time detection of single electrons inside a n-p-n bipolar junction transistor at room temperature. Single electrons injected through the base-emitter junction trigger with a high probability the avalanche breakdown of the strongly reverse ...

2008

Single-chip detector for electron spin resonance spectroscopy

Giovanni Boero

We have realized an innovative integrated detector for electron spin resonance spectroscopy. The microsystem, consisting of an LC oscillator, a mixer, and a frequency division module, is integrated onto a single silicon chip using a conventional complement ...

2008

Two-dimensional magnetic resonance force microscopy using full-volume Fourier and Hadamard encoding

Giovanni Boero, Jürgen Brugger, Schahrazede-Lila Mouaziz

A rapid acquisition method for two-dimensional (2D) magnetic resonance force microscopy images is described. Spatial resolution is based on gradients in the static magnetic field B0 and in the applied radiofrequency field B1. Hadamard- and Fourier-encoding ...

2008

A Low-Noise CMOS Receiver Frontend for MRI

Giovanni Boero, Jens Anders

In this paper a novel architecture for an integrated receiver front-end for micro magnetic resonance imaging (micro-MRI) applications is described. While the chip consumes only 9mA supply current (4mA in the LNA and 5mA in the output buffer) from a 33V pow ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2008

Direct observation of nuclear spin diffusion in real space

Giovanni Boero, Jürgen Brugger, Schahrazede-Lila Mouaziz

Images directly visualizing the spatial spin-diffusion process are reported. The measurements were performed using a magnetic resonance force microscope. The field gradient associated with the forcedetection experiment is large enough to affect the spin dy ...

2007

Highly Sensitive Cantilevers, with and without Magnetic Tip, for Magnetic Resonance Force Microscopy

Giovanni Boero, Jürgen Brugger, Alain Dysli, Schahrazede-Lila Mouaziz

In this paper we present the fabrication and characterization of highly sensitive cantilevers, with and without magnetic tip, used for magnetic resonance force microscopy experiments. The full wafer silicon batch microfabrication was successful and the ach ...

IEEE2007

Integrated Nickel Micro-Nano-Hall Sensors on SU-8 Cantilevers for Scanning Hall Probe Microscopy

Radivoje Popovic, Giovanni Boero, Christian Santschi, Chantal Imboden, Jürgen Brugger, Schahrazede-Lila Mouaziz, Oscar Vazquez Mena

We report the fabrication and characterization of nickel Hall sensors integrated on SU-8 cantilevers. Sensors having active area down to 1x1 μm 2 show a magnetic field resolution better than 1μT/Hz 1/2 in the thermal noise frequency range. The fabricated d ...

IEEE2007

An integrated micro-Hall probe for scanning magnetic microscopy

Radivoje Popovic, Giovanni Boero, Pavel Kejik

Anewmicrosystem with the ability to detect magnetic microstructures based on the non-invasive Hall principle is presented. The micro-Hall plate embedded in the microsystem and scaled down to the physical limits of the employedCMOStechnology has an active a ...

Elsevier2006

Hall sensor and method of operating a Hall sensor

Radivoje Popovic, Giovanni Boero, Pavel Kejik, Predrag Drljaca

A Hall sensor comprises a Hall element (1; 30; 31; 60) and an amplifier (2; 32; 33). The Hall element is placed inside the amplifier so that the current flowing through the Hall element also flows through the transistors of an amplifier stage of the amplif ...

2006

Polymer-based cantilevers with integrated electrodes

Radivoje Popovic, Giovanni Boero, Jürgen Brugger, Schahrazede-Lila Mouaziz

An innovative release method of polymer cantilevers with embedded integrated metal electrodes is presented. The fabrication is based on the lithographic patterning of the electrode layout on a wafer surface, covered by two layers of SU-8 polymer: a 10-um-t ...

Institute of Electrical and Electronics Engineers2006

Combined Al-protection and HF-vapor release process for ultrathin single crystal silicon cantilevers

Giovanni Boero, Jürgen Brugger, Schahrazede-Lila Mouaziz

A new technology based on a combination of Al-protection layers and HF-vapor etching to produce ultrathin single crystal silicon cantilevers is presented. 500 um long, 10 um wide and 0.5 um thick cantilevers have been fabricated with a high yield. A resona ...

2006

Electrically conducting probes with full tungsten cantilever and tip for scanning probe applications

Andrzej Kulik, Giovanni Boero, Florian Calame, Jürgen Brugger, Johannes Steen, Kyumin Lee

We have developed a new hybrid AFM probe combining an SU-8 polymer body with a full tungsten cantilever having a nanometric tip. The fabrication is based on surface micromachining a silicon wafer, where tungsten is sputter deposited in oxidation sharpened ...

2006

Submicrometer Hall devices fabricated by focused electron-beam-induced deposition

Radivoje Popovic, Giovanni Boero, Patrik Willi Hoffmann, Pavel Kejik, Niels Quack, Tristan Bret, Jürgen Brugger, Schahrazede-Lila Mouaziz

Hall devices having an active area of about (500 nm)(2) are fabricated by focused electron-beam-induced deposition. The deposited material consists of cobalt nanoparticles in a carbonaceous matrix. The realized devices have, at room temperature, a current ...

American Institute of Physics2005

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