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Publications associées (292)

Field-controlled rotation of spin-wave nanochannels in bi-component magnonic crystals

We investigate bi-component magnonic crystals consisting of periodic square lattices of Co nanodiscs embedded in Permalloy thin films. Micromagnetic simulations are used to analyse experimental data obtained with both all-electrical broadband spectroscopy ...

2014

Improving T2 -weighted imaging at high field through the use of kT -points

Rolf Gruetter, José Pedro Rebelo Ferreira Marques, Kieran O'Brien, Florent Eggenschwiler

PURPOSE: At high magnetic field strengths (B0 >/= 3 T), the shorter radiofrequency wavelength produces an inhomogeneous distribution of the transmit magnetic field. This can lead to variable contrast across the brain which is particularly pronounced in T2 ...

Wiley-Blackwell2014

Generation of Whistler-Wave Heated Discharges with Planar Resonant rf Networks

Christoph Hollenstein, Alan Howling, Philippe Frédérique Bruno Guittienne

Magnetized plasma discharges generated by a planar resonant rf network are investigated. A regime transition is observed above a magnetic field threshold, associated with rf waves propagating in the plasma and which present the characteristics of whistler ...

Amer Physical Soc2013

Nanostripe of subwavelength width as a switchable semitransparent mirror for spin waves in a magnonic crystal

Dirk Grundler

Spin wave transmission experiments are performed on a one-dimensional magnonic crystal (MC) where an injection pad for domain walls reverses the magnetization M of selected nanostripes independently from the otherwise saturated MC. The MC consists of a per ...

2013

Propagation of Spin Waves Excited in a Permalloy Film by a Finite-Ground Coplanar Waveguide: A Combined Phase-Sensitive Micro-Focused Brillouin Light Scattering and Micromagnetic Study

Dirk Grundler

The excitation of spin waves by a microwave current injected into a coplanar waveguide with finite-width ground lines on a continuous Permalloy film is investigated both experimentally and numerically. Phase sensitive micro-focused Brillouin light scatteri ...

2013

Omnidirectional spin-wave nanograting coupler

Dirk Grundler, Haiming Yu

Magnonics as an emerging nanotechnology offers functionalities beyond current semiconductor technology. Spin waves used in cellular nonlinear networks are expected to speed up technologically, demanding tasks such as image processing and speech recognition ...

2013

Towards reconfigurable RF devices based on dielectric elastomer actuators

Herbert Shea, Julien Perruisseau-Carrier, Samuel Rosset, Pietro Romano, Oluwaseun Adelowo Araromi

Radio Frequency (RF) devices generate or control the transmission or reception of electromagnetic (EM) waves such as are used in mobile phones, WIFI etc. Microwave (MW) and millimeter‐wave (MMW) devices are used widely in satellite communications. Dynamic ...

2013

Magnonic crystal wave guide with large spin-wave propagation velocity in CoFeB

Dirk Grundler

Propagating spin-wave spectroscopy is reported for two-dimensional CoFeB antidot lattices (ADLs) with perpendicular-to-plane magnetization. The magnonic crystals consist of square lattices of 190 nm diameter holes with different periods p. At p = 600 nm, t ...

American Institute of Physics2013

Graphene Antennas: Can Integration and Reconfigurability Compensate for the Loss?

Julien Perruisseau-Carrier, Michele Tamagnone

In this opening presentation we will first recall the main characteristics of graphene conductivity and electromagnetic wave propagation on graphene-based structures. Based on these observations and different graphene antenna simulations from microwave to ...

Ieee2013

FE heterogeneous multiscale method for long time wave propagation

Assyr Abdulle

A new finite element heterogeneous multiscale method (FE-HMM) is proposed for the numerical solution of the wave equation over long times in a rapidly varying medium. Our FE-HMM captures long-time dispersive effects of the true solution at a cost similar t ...

Elsevier France-Editions Scientifiques Medicales Elsevier2013

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