Description Developing materials, stacks and processes for ultimate non volatile memories. Partners CROCUS Technology, Grenoble, France Groupe de physique des matériaux, Rouen, France Institut Néel, Grenoble, France L_SIM, Grenoble, France ICREA, Barcelona, Spain IMDEA, Madrid, Spain UMR CNRS/Thalès Financing CROCUS Technology ERC HYMAGINE Objectives Understanding and mastering exchange bias properties and their distributions in magnetoresistive […]

Perpendicular Anisotropy Materials for High-Density Non-volatile Magnetic Memory Cells Description The project aims at building the knowledge to fabricate perpendicular anisotropy magnetic tunnel junctions, and more generally the realization of perpendicular anisotropy layers for use as magnetic tunnel junction electrodes or perpendicular spin polarisers. The perpendicular anisotropy material development, will allow the demonstration of four […]

La qualité magnétique de l’interface entre des couches ferromagnétique et antiferromagnétique est essentielle pour les performances d’une mémoire. Des chercheurs de l’Inac ont proposé d’insérer une barrière empêchant la diffusion des éléments d’une couche dans l’autre. Ils ont pu évaluer l’état magnétique de l’interface grâce à une méthode originale en laboratoire, sans recourir à de […]

Description Exploring spin dependent transport properties of antiferromagnets and assessing antiferromagnetic spintronics Partners CEA/INAC/SP2M/Nanostructure et Magnétisme, Grenoble, France Michigan state University and University of Texas at Austin, USA Financing Cluster Micro-Nano 2009 ’STARAC’ Objectives The goal of this project is : 1) To better understand, to quantify, and to manipulate spin dependent transport in antiferromagnets […]

S. Petit, N. de Mestier, C. Baraduc, C. Thirion, B. Diény We showed for the first time that the widely studied “spin transfer torque” phenomenon presents a measurable effect below the critical threshold. In the sub-critical regime, the transfer of momentum from the conduction electrons to the magnetisation fluctuations results in a surprising dependence of […]

Description We observe and model the dynamics of a magnetic vortex that circles inside a tunnel junction submitted to a very strong dc current. Partners Institut Néel, Grenoble : C. Thirion Headway Technology, Milpitas, CA-USA Objectives Vortex oscillators could be an alternative to the classical macrospin spintronic RF oscillators. Their main advantage is a naturally […]

Why is the linewidth broadened ? Phasenoise is the parameter that any engineer will ask you to provide in order to evaluate the performance and to define possible applications for an oscillator. From theory [Kim, Slavin], phase noise is a major contribution to linewidth broadening and linewidth is thus a good first indicator for phase […]

What are typical linewidths ? Besides output power (for which good strategies exist to reach the required specifications), linewidth is an important issue and determines basically the type of applications where STOs can compete. The linewidth measured in the literature for a large variety of oscillators varies from about 1 GHz to 1 MHz (with […]

What are the requirements ? Integration of STOs into conventional RF circuitry means that the STO has to meet certain specifications. The most important are output power and phasenoise. In this section we consider only the output power. In technical terms, the STO has to deliver 0dBm, for instance when its output is connected to […]

How to stabilize an ascillation around the energy maximum ? Why a perpendicular polarizer ? First experiments of spin torque driven excitations using an in-plane magnetized polarizer (in a standard spin valve structures) [Cornell, NIST] showed (i) that a non-zero external magnetic field is required to induce auto-oscillations and (ii) that the oscillation amplitude makes […]