In WP1, studies were conducted to understand the mechanisms responsible for the dielectric breakdown in magnetic tunnel junctions (MTJs). A key asset of STT-MRAM is their write endurance which is much better than in all other technologies of non-volatile memories (FLASH, 105 cycles; PCRAM, 109 cycles; ReRAM, 1010 10 cycles). Combined with their speed (switching time 1-5ns), and density […]

Une jonction tunnel magnétique exploite des variations de résistance électrique sous l’effet d’un champ magnétique. Des chercheurs de l’Inac ont montré que l’insertion d’une couche « tampon » entre deux structures cristallines différentes peut augmenter de 75% la magnétorésistance d’une jonction à aimantation perpendiculaire, ce qui offre la perspective d’une réduction significative de la consommation […]

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 […]

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 […]

Increasing Output Power by impedance matching Description Impedance mismatch between the STNO device (for MTJs 100 – 1000 Ohm) and standard RF circuitry (at 50 Ohm) leads to a reduction of the output power of 10 dB. Proper impedance matching is thus important. Partners LETI/DCOS ; LETI/DACLE Financing ANR-05-NANO-44 MagICO (2005-2008) ; OSEO/Anvar (2005-2009) ; Carnot RF (2006-20010) ; […]

Spin torque driven excitation spectra and microwave performances for different STNO configurations Description The dynamic response under spin transfer torque depends on the magnetization configuration of the polarizer and the free layer. At SPINTEC we have focused on two configurations which are (i) a perpendicular polarizer or (ii) a synthetic antiferromagnetic free layer. Partners LETI/DCOS […]

Injection and detection of pure spin currents using ferromagnetic resonance Description Damping enhancement in ferromagnetic resonance to study spin current injection from FM1 and spin absorption in FM2 or NM in magnetic heterostructures FM1/Cu/FM2 or FM1/Cu/NM. Partners Prof. W. E. Bailey, Columbia University, New York, USA F. Wilhelm, A. Rogalev, European Synchrotron Radiation Facility (ESRF), […]

Development of magnetic tunnel junctions (MTJ) of low RA and high TMR Description Optimization of the deposition parameters using the LETI/DCOS IBS sputtering deposition tool from SPTS to realize high quality magnetic tunnel junction oscillators of different device configurations. Partners LETI/DCOS (Marie Claire Cyrille) CEA/SPEC Saclay (Olivier Klein) CNRS/THALES (Vincent Cros, Julien Kermorvant) Financing ANR-09-NANO-037 […]

L.D. Buda-Prejbeanu, H. Szambolics, F. Garcia-Sanchez, I. Firastrau, J.Ch. Toussaint The effect of the spin polarized current on the magnetization dynamics is an extremely hot topic nowadays both from fundamental and applicative point of view. The micromagnetic modeling become in this context an irreplaceable prediction tool for exploring at nm length scale the magnetization distribution […]