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Large amplitude spin torque vortex oscillations at zero external field using a perpendicular spin polarizer

2014; American Institute of Physics; Volume: 105; Issue: 2 Linguagem: Inglês

10.1063/1.4885537

1520-8842

A. Dussaux, Eva Grimaldi, B. Rache Salles, A. Jenkins, A. V. Khvalkovskiy, Paolo Bortolotti, Julie Grollier, Hitoshi Kubota, Akio Fukushima, Kay Yakushiji, Shinji Yuasa, Vincent Cros, A. Fert,

Physics of Superconductivity and Magnetism

We investigate the microwave response of a spin transfer vortex based oscillator in a magnetic tunnel junction with an in-plane reference layer combined with a spin valve with an out-of-plane magnetization spin polarizing layer. The main advantage of this perpendicular spin polarizer is to induce a large spin transfer force even at zero magnetic field, thus leading to a record emitted power (up to 0.6 μW) associated to a very narrow spectral linewidth of a few hundreds of kHz. The characteristics of this hybrid vortex based spin transfer nano-oscillator obtained at zero field and room temperature are of great importance for applications based on rf spintronic devices as integrated and tunable microwave source and/or microwave detector.