Physics-based SPICE model of spin-torque oscillators

Hyein Lim, Sora Ahn, Seungjun Lee, Hyungsoon Shin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The spin-torque oscillator (STO) is a new compact device operating as a tunable RF oscillator in the tens of gigahertz range whose characteristics are determined by the applied current and magnetic field. In this paper, we present a physics-based empirical circuit-level model of an STO that is compatible with circuit-level simulators such as SPICE. The characteristics of an STO are modeled as physics-based analytic functions of the applied current and external magnetic field. The validity of our model was verified by the HSPICE simulation of a current mirror circuit that contains an STO element. The simulation results are in good agreement with the experimental data in the normal operation range. High-order nonlinear effects at large currents are not included in our model because there is no theoretical equation available yet that can precisely explain these effects.

Original languageEnglish
Article number04DM03
JournalJapanese Journal of Applied Physics
Issue number4 PART 2
StatePublished - Apr 2012


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