Spin-polarized current induced switching in Co/Cu/Co pillars

We present experiments of magnetization reversal by spin injection performed on pillar-shaped Co/Cu/Co trilayers. The pillars (200×600 nm2) are fabricated by electron beam lithography and reactive ion etching. Our data for the magnetization reversal at a threshold current confirm previous results on similar pillars. In addition, we present another type of experiment that also clearly evidences the control of the magnetic configuration by the current intensity. Our interpretation is based on a version of the Slonczewski model in which the polarization of the current is calculated in the Valet–Fert model of the giant magnetoresistance with current applied perpendicular to plane.

[1]  Fert,et al.  Theory of the perpendicular magnetoresistance in magnetic multilayers. , 1993, Physical review. B, Condensed matter.

[2]  R. Loloee,et al.  Two-channel analysis of CPP-MR data for Ag/Co and AgSn/Co multilayers , 1993 .

[3]  J. Pflaum,et al.  Gilbert damping and g-factor in FexCo1−x alloy films , 1995 .

[4]  Berger.  Emission of spin waves by a magnetic multilayer traversed by a current. , 1996, Physical review. B, Condensed matter.

[5]  J. Slonczewski.  Current-driven excitation of magnetic multilayers , 1996 .

[6]  Shou-Cheng Zhang,et al.  MODIFICATION OF THE LANDAU-LIFSHITZ EQUATION IN THE PRESENCE OF A SPIN-POLARIZED CURRENT IN COLOSSAL- AND GIANT-MAGNETORESISTIVE MATERIALS , 1998 .

[7]  J. Bass,et al.  Excitation of a magnetic multilayer by an electric current , 1998 .

[8]  Jean-Eric Wegrowe,et al.  Current-induced magnetization reversal in magnetic nanowires , 1999 .

[9]  G. A. Prinz,et al.  Switching of vertical giant magnetoresistance devices by current through the device , 1999 .

[10]  Ralph,et al.  Current-induced switching of domains in magnetic multilayer devices , 1999, Science.

[11]  R. Buhrman,et al.  Current-induced realignment of magnetic domains in nanostructured Cu/Co multilayer pillars , 2000 .

[12]  J.-E. Wegrowe.  Thermokinetic approach of the generalized Landau-Lifshitz-Gilbert equation with spin-polarized current , 2000 .

[13]  Robert A. Buhrman,et al.  Spin-polarized current switching of a Co thin film nanomagnet , 2000 .

[14]  Xavier Waintal,et al.  Role of spin-dependent interface scattering in generating current-induced torques in magnetic multilayers , 2000 .

[15]  Ralph,et al.  Current-driven magnetization reversal and spin-wave excitations in Co /Cu /Co pillars , 1999, Physical review letters.

[16]  P. E. Zilberman,et al.  Current-driven switching of magnetic layers , 2001 .