Jean-Pierre Nozieres

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The possibility of exciting microwave oscillations in a nanomagnet by a spin-polarized current, as predicted by Slonczewski and Berger, has recently been demonstrated. This observation opens important prospects of applications in radiofrequency components. However, some unresolved inconsistencies are found when interpreting the magnetization dynamics within(More)
We present, herein, an extended study of the half-Heusler alloy NiMnSb, starting with the deposition technique, continuing with the basic structural and magnetic properties of the thin films, and finishing with the electronic and compositional properties of their surfaces. The experimental methods we apply combine magnetization and magnetoresistivity(More)
Spintronics (or spin-electronics) is a continuously expending area of research and development at the merge between magnetism and electronics. It aims at taking advantage of the quantum characteristic of the electrons, i. e. its spin, to create new functionalities and new devices. Spintronic devices comprise magnetic layers which serve as spin polarizers or(More)
Pinning type coercivity has been induced in large sø50 mmd particles of Sm2Fe17N3 by irradiation with 5 GeV Pb561 ions. Mössbauer spectroscopy is used to analyze the structure of the defects and estimate their volume. Magnetization measurements indicate that the induced defects are anisotropic in shape. A model of strong pinning by cylindrical defects is(More)
The recent advent of spin transfer torque (STT) has shed a new light on MRAM with the promises of much improved performances and greater scalability to very advanced technology nodes. As a result, MRAM is now viewed as a credible solution for stand-alone and embedded applications where the combination of non-volatility, speed and endurance is key. Whereas(More)
A novel process for permanent magnets fabrication is described: low cost and good energy products are achieved by hot-working cast ingot of NdFeB alloys. Magnetic characterization and microstructural observation reveal that the coercivity mechanisms are essentially similar to those observed in sintered magnets. Introduction few unbroken grains around 20 pm(More)