title: Spin-torque oscillator using a perpendicular polarizer and a planar free layer.
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.
authors.affiliation: SPINTEC URA 2512, C.E.A/DRFMC-CNRS, Commissariat á l'Energie Atomique-Grenoble, 17 rue des Martyrs, 38054 Grenoble, France.
authors.forename: D
authors.initials: D
authors.lastname: Houssameddine
authors.forename: U
authors.initials: U
authors.lastname: Ebels
authors.forename: B
authors.initials: B
authors.lastname: Delaët
authors.forename: B
authors.initials: B
authors.lastname: Rodmacq
authors.forename: I
authors.initials: I
authors.lastname: Firastrau
authors.forename: F
authors.initials: F
authors.lastname: Ponthenier
authors.forename: M
authors.initials: M
authors.lastname: Brunet
authors.forename: C
authors.initials: C
authors.lastname: Thirion
authors.forename: J-P
authors.initials: JP
authors.lastname: Michel
authors.forename: L
authors.initials: L
authors.lastname: Prejbeanu-Buda
authors.forename: M-C
authors.initials: MC
authors.lastname: Cyrille
authors.forename: O
authors.initials: O
authors.lastname: Redon
authors.forename: B
authors.initials: B
authors.lastname: Dieny