Houssameddine D, Ebels U, Delaët B, Rodmacq B, Firastrau I, Ponthenier F, Brunet M, Thirion C, Michel JP, Prejbeanu-Buda L, Cyrille MC, Redon O, Dieny B. Spin-torque oscillator using a perpendicular polarizer and a planar free layer.
Nat Mater 2007;
6:441-7. [PMID:
17468761 DOI:
10.1038/nmat1905]
[Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2006] [Accepted: 04/05/2007] [Indexed: 05/15/2023]
Abstract
Spintronics materials have recently been considered for radio-frequency devices such as oscillators by exploiting the transfer of spin angular momentum between a spin-polarized electrical current and the magnetic nanostructure it passes through. While previous spin-transfer oscillators (STOs) were based on in-plane magnetized structures, here we present the realization of an STO that contains a perpendicular spin current polarizer combined with an in-plane magnetized free layer. This device is characterized by high-frequency oscillations of the free-layer magnetization, consistent with out-of-plane steady-state precessions induced at the threshold current by a spin-transfer torque from perpendicularly polarized electrons. The results are summarized in static and dynamic current-field state diagrams and will be of importance for the design of STOs with enhanced output signals.
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