Nonlinear Auto-Oscillator Theory of Microwave Generation by Spin-Polarized Current

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Spintronics: Fundamentals and applications

Jaroslav Fabian, S Sarma, Igor Zutić (2004)

Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems. This article reviews the current status of this subject, including both recent advances and well-established results. The primary focus is on the basic physical principles underlying the generation of carrier spin polarization, spin dynamics, and spin-polarized transport in semiconductors and metals. Spin transport differs from charge transport in that spin is a nonconserved quantity in solids due to spin-orbit and hyperfine coupling. The authors discuss in detail spin decoherence mechanisms in metals and semiconductors. Various theories of spin injection and spin-polarized transport are applied to hybrid structures relevant to spin-based devices and fundamental studies of materials properties. Experimental work is reviewed with the emphasis on projected applications, in which external electric and magnetic fields and illumination by light will be used to control spin and charge dynamics to create new functionalities not feasible or ineffective with conventional electronics.

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Classics in Magnetics A Phenomenological Theory of Damping in Ferromagnetic Materials

T.L. Gilbert (2004)

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Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current

D C Ralph, R. J. Schoelkopf, N C Emley … (2003)

We describe direct electrical measurements of microwave-frequency dynamics in individual nanomagnets that are driven by spin transfer from a DC spin-polarized current. We map out the dynamical stability diagram as a function of current and magnetic field, and we show that spin transfer can produce several different types of magnetic excitations, including small-angle precession, a more complicated large-angle motion, and a high-current state that generates little microwave signal. The large-angle mode can produce a significant emission of microwave energy, as large as 40 times the Johnson-noise background.

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Title: IEEE Transactions on Magnetics

Abbreviated Title: IEEE Trans. Magn.

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

ISSN (Print): 0018-9464

Publication date Created: April 2009

Publication date (Print): April 2009

Volume: 45

Issue: 4

Pages: 1875-1918

Article

DOI: 10.1109/TMAG.2008.2009935

SO-VID: 1f863c26-2c81-403b-a40e-aee6d3f72893

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Nonlinear Auto-Oscillator Theory of Microwave Generation by Spin-Polarized Current

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Most cited references 119

Spintronics: Fundamentals and applications

Classics in Magnetics A Phenomenological Theory of Damping in Ferromagnetic Materials

Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current

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