Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars

Details Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars

1999-08-16

arxiv.org/abs/cond-mat/9908231v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.84.3149

Using thin film pillars ~100 nm in diameter, containing two ferromagnetic Co layers of different thicknesses separated by a paramagnetic Cu spacer, we examine effects of torques due to spin-polarized currents flowing perpendicular to the layers. In accordance with spin-transfer theory, spin-polarized electrons flowing from the thin to the thick Co layer can switch the magnetic moments of the layers antiparallel, while a reversed electron flow causes switching to a parallel state. When large magnetic fields are applied, the current no longer fully reverses the magnetic moment, but instead stimulates spin-wave excitations.

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