The discoveries of giant magneto-resistance and spin-transfer torque effects are milestones in the history of magnetism. During the last two decades, they have fueled a conspicuous research activity in the field of nanotechnology, giving rise even to a new scientific branch, the spintronics, a neologism for spin-based electronics. From the very beginning, in fact, experimental results pointed out several potential applications of spintronic devices, such as magnetic random-access-memories, sensors, nano-oscillators, modulators and receivers working at microwave frequency. An overview of these devices will be here provided, emphasizing their behavior and the applications.
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