1,720,963 research outputs found
Spin-torque oscillators using perpendicular anisotropy in CoFeB–MgO magnetic tunnel junctions
No full textA new class of magnetic tunnel junctions (MTJ) with perpendicular anisotropy has been recently used for fast switching applications. A theoretical investigation for these materials to be applied as microwave nano-oscillators is here reported. We demonstrate micro-magnetically the possibility to have both high frequency and high power microwave emission at zero field in a double magnetic tunnel junction. Our predictions give rise to the design of a more compact and easily embedded spin-torque oscillators for all-on-chip applications. To increase the oscillator power, we also demonstrate the possibility to obtain frequency locking at zero field by applying a low current at microwaves
Diagonal Mesh Equivalent (DME) for the calculation of the hysteresis losses in electrical machines
No full textThe Magnetic Equivalent Circuits (MECs) technique is a powerful tool for machine analysis and power losses computation. Here, use is made of the Diagonal Mesh Equivalent (DME) to solve the equivalent electrical circuit for the branch fluxes to be easily computed and related to the machine compartments of technical interest. These are represented by the air gap, stator and rotor to name a few. Hysteresis loops have been computed, along with the static power losses, for assigned stator thicknesses and compared to ones alternatively obtained by the Modified Scalar Preisach Model. This study is especially aimed at giving improved issues to those who are engaged in the design of magnetic components for electrical machines
Electromagnetic Performances of Concentrated Groundings Striken by Lightning Discharges
No full textProceedings con Refere
Micromagnetic Study of Synchronization of Nonlinear Spin-Torque Oscillators to Microwave Current and Field
Full text linkThe nonautonomous dynamics of spin-torque oscillators in presence of both microwave current and field has been numerically studied in nanostructured devices. When both microwave current and field are applied at the same frequency, integer phase locking at different locking ratio is found. In the locking region, a study of the intrinsic phase shift between the locking force (current or field) and the giant magnetoresistive signal as a function of the bias current is also exploited
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