Caractérisation des oscillateurs spintroniques basés sur des couches magnétiques couplées

Abstract : Spin-torque nano-oscillators (STNOs) are promising candidates for integrated radiofrequency (RF) components due to their nanoscale size, the large range of base frequencies that can be covered, as well as the large achievable tuning ranges around the base frequency. The RF signal is obtained due to the spin transfer torque (STT) generating a non-linear magnetization oscillation in a magnetoresistive device. In the past, these excitations were investigated using the picture of a single (or independent) layer. However, many features of the excitation spectra observed experimentally in nanopillar devices cannot be explained considering a single layer. In this thesis we address the important question on the dynamical coupling between the magnetic layers inside a magneto-resistive nanopillar device, to gain a better understanding of the excitation spectra, i.e. the dependence of the frequency and the linewidth on current and applied magnetic field. A first study is realized for a coupled system, composed by two ferromagnetic layers, coupled by the interlayer RKKY coupling (so called Synthetic Ferrimagnet SyF). Due to the coupling the frequency dependence versus current is different as compared to excitations of a single layer. This is explained by the strong dynamical RKKY coupling. A second study considers a more complex interaction, occurring within standard STNO nanopillar spin valves or tunnel junctions. They are composed by a SyF separated by a metallic or insulating spacer respectively from the single free layer (FL). For this system we take into account besides the RKKY coupling within the SyF, also the dynamical dipolar field coupling and the mutual spin torque (MSTT) between the SyF and the free layer. We find two definite signatures arising from this coupling. The first is a gap in the steady state excitation spectra that is due to the hybridization of the SyF and FL modes in the damped regime. The second is the possibility of the spintorque driven excitation or its harmonics with the damped modes leading to discontinuities in the frequency field dependence when the free layer is dominantly excited. Interestingly this leads to a region of reduced linewidth. Furthermore for SyF layer dominated excitations, the linewidth is lower than in the FL dominated excitations. From these observations we propose a more complex structure, composed by two SyF layers where the single FL is replaced by a SyF. The results obtained by a combination of experiments, numerical simulations and analytical analysis, demonstrate the important role of the dynamic interactions in nanopillar STNOs and provide routes for designing novel STNO configurations that should lead to improved microwave performances.
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Elmer Monteblanco Vinces. Caractérisation des oscillateurs spintroniques basés sur des couches magnétiques couplées. Autre [cond-mat.other]. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENY024⟩. ⟨tel-01071546⟩

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