Critical current density for spin transfer torque switching with composite free layer structure

Details Critical current density for spin transfer torque switching with composite free layer structure Critical current density for spin transfer torque switching with composite free layer structure

2009-09-15

arxiv.org/abs/0909.2711v1

Current Applied Physics, 10 952-956 (2010)

Physics

Condensed Matter

Materials Science

13 pages with 5 figures

Scientific paper

10.1016/j.cap.2009.11.079

Critical current density of composite free layer (CFL) in magnetic tunneling junction is investigated. CFL consists of two exchange coupled ferromagnetic layers, where the coupling is parallel or anti-parallel. Instability condition of the CFL under the spin transfer torque, which is related with critical current density, is obtained by analytic spin wave excitation model and confirmed by macro-spin Landau-Lifshitz-Gilbert equation. The critical current densities for the coupled two identical layers are investigated with various coupling strengths, and spin transfer torque efficiencies.

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