engleski

Magnetization reversal by spin injection: experiments and theory

We present experiments of the magnetization reversal by spin injection obtained on the pillar-shaped Co/Cu/Co trilayers. The pillars are fabricated by e- beam lithography and reactive ion etching. Their small section (200 x 600 nm^2) allowed the injection a current density of about 10^7 A/cm^2. Our data confirm similar previous results by the Cornell's group. In addition, we present a new type of experiment, which also evidences clearly the control of the magnetic configuration by the current intensity. The interpretation is based on the Slonczewski’s equations with a calculation of the current spin polarization based on the VF model of CPP-GMR. This type of calculation predicts right order of magnitude of the critical currents, but some discrepancy between calculation and experiments for the critical current asymmetry and their field dependence remains.

magnetization reversal; spin injection; spin electronics

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