Spin transfer in diffusive ferromagnet normal metal systems with spin-flip scattering

The spin transfer in biased disordered ferromagnet (F)-normal metal (N) systems is calculated by the diffusion equation. For F1-N2-F2 and N1-F1-N2-F2-N3 spin valves, the effect of spin-flip processes in the normal metal and ferromagnet parts are obtained analytically. Spin-flip in the center metal N2 reduces the spin-transfer, whereas spin-flip in the outer normal metals N1 and N3 can increase it by effectively enhancing the spin polarization of the device.

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

[2]  P. Levy,et al.  Mechanisms of spin-polarized current-driven magnetization switching. , 2002, Physical review letters.

[3]  Daniel Huertas-Hernando,et al.  Conductance modulation by spin precession in noncollinear ferromagnet normal-metal ferromagnet systems , 2000 .

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

[5]  W. Pratt,et al.  Current-perpendicular (CPP) magnetoresistance in magnetic metallic multilayers , 1999 .

[6]  Spin-transport in multi-terminal normal metal-ferromagnet systems with non-collinear magnetizations , 2000, cond-mat/0006174.

[7]  K. Xia,et al.  Spin torques in terromagnet/normal metal structures , 2001, cond-mat/0107589.

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

[9]  M. D. Stiles,et al.  Anatomy of spin-transfer torque , 2002 .

[10]  W. Pratt,et al.  Measurement of resistance and spin-memory loss (spin relaxation) at interfaces using sputtered current perpendicular-to-plane exchange-biased spin valves , 2000 .

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

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

[13]  Interface resistance of disordered magnetic multilayers , 2000, cond-mat/0005314.

[14]  A. Fert,et al.  Spin-polarized current induced switching in Co/Cu/Co pillars , 2001 .

[15]  Ph. Guittienne,et al.  Spin-polarized current induced magnetization switch: Is the modulus of the magnetic layer conserved? (invited) , 2002 .

[16]  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 .

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

[18]  Nazarov,et al.  Finite-element theory of transport in ferromagnet-normal metal systems , 2000, Physical review letters.

[19]  Noncollinear spin transfer in Co/Cu/Co multilayers (invited) , 2001, cond-mat/0110275.

[20]  Phase coherent transport in hybrid superconducting nanostructures , 1997, cond-mat/9708056.