Journal Article

PreJuSER-6454

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetization dynamics in spin torque nano-oscillators: Vortex state versus uniform state

Lehndorff, R.FZJ* ; Bürgler, D. E.FZJ* ; Gliga, S.FZJ* ; Hertel, R.FZJ* ; Grünberg, P. A.FZJ* ; Schneider, C. M.FZJ*

2009
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/11018  doi:10.1103/PhysRevB.80.054412

Abstract: Current-driven magnetization dynamics in spin torque nano-oscillators (STNOs) is intensely investigated because of its high potential for high-frequency (HF) applications. We experimentally study current-driven HF excitations of STNOs for two fundamental magnetization states of the free layer, namely, vortex state and uniform in-plane magnetization. Our ability to switch between the two states in a given STNO enables a direct comparison of the critical currents, agility, power, and linewidth of the HF output signals. We find that the vortex state has some superior properties, in particular, it maximizes the emitted HF power and shows a wider frequency tuning range at a fixed magnetic field.

Keyword(s): J ; giant magnetoresistance (auto) ; gold (auto) ; iron (auto) ; magnetic multilayers (auto) ; magnetic switching (auto) ; magnetisation (auto) ; micromagnetics (auto) ; silver (auto) ; spin polarised transport (auto) ; vortices (auto)

Note: We would like to thank R. Schreiber and F.-J. Kohne for technical support. This work was partly funded by the German academic exchange service (DAAD) while at UCCS by the NSF (Grant No. DMR-0605629) and the ARO (Grant No. W911NF-04-1-0247).

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Contributing Institute(s):

1. Elektronische Eigenschaften (IFF-9)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2009

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