Domain wall displacement by current pulses injection in submicrometer Permalloy square ring structures

The magnetoresistance in submicrometer Permalloy square ring structures has been experimentally measured and modeled. The authors show that using an external field they can place a head-to-head domain wall at a selected corner of the ring and sense its position by magnetoresistance. They finally demonstrate that a domain wall can be reversibly and controllably displaced by current pulses of different polarity. Their observations can be explained by a directional spin-torque effect.

[1]  Paolo Vavassori,et al.  Control of magnetic vortex chirality in square ring micromagnets , 2005 .

[2]  A. Bleloch,et al.  Observation of a bi-domain state and nucleation free switching in mesoscopic ring magnets. , 2001, Physical review letters.

[3]  A. Locatelli,et al.  Domain wall behaviour at constrictions in ferromagnetic ring structures , 2004 .

[4]  Russell P. Cowburn,et al.  Domain wall propagation in magnetic nanowires by spin-polarized current injection , 2003 .

[5]  G. Faini,et al.  Switching a spin valve back and forth by current-induced domain wall motion , 2003 .

[6]  G. Tatara,et al.  Theory of current-driven domain wall motion: spin transfer versus momentum transfer. , 2004, Physical review letters.

[7]  B. Ilic,et al.  Effects of structural nonplanarity on the magnetoresistance of Permalloy circular rings , 2007 .

[8]  G. Faini,et al.  Controlled magnetic switching in single narrow rings probed by magnetoresistance measurements , 2002 .

[9]  Paolo Vavassori,et al.  Magnetoresistance of single magnetic vortices , 2005 .

[10]  Y. Nakatani,et al.  Domain wall motion by spin-polarized current: a micromagnetic study , 2004 .

[11]  G. A. Prinz,et al.  Detection of a micron-sized magnetic sphere using a ring-shaped anisotropic magnetoresistance-based sensor: A model for a magnetoresistance-based biosensor , 2002 .

[12]  Jacques Miltat,et al.  Head-to-head domain walls in soft nano-strips: a refined phase diagram , 2005 .

[13]  Mathias Kläui,et al.  Observation of thermally activated domain wall transformations , 2006 .

[14]  Edmond Cambril,et al.  Domain wall motion induced by spin polarized currents in ferromagnetic ring structures , 2003 .

[15]  H. Tanigawa,et al.  Effect of Joule heating in current-driven domain wall motion , 2005 .

[16]  L. Berger,et al.  Prediction of a domain-drag effect in uniaxial, non-compensated, ferromagnetic metals , 1974 .

[17]  G. Faini,et al.  Domain wall pinning in narrow ferromagnetic ring structures probed by magnetoresistance measurements. , 2003, Physical review letters.

[18]  L. Berger,et al.  Exchange interaction between ferromagnetic domain wall and electric current in very thin metallic films , 1984 .

[19]  S. G. Kim,et al.  Magnetization reversal in submicron ferromagnetic dots and antidots arrays , 1998 .

[20]  W Wernsdorfer,et al.  Controlled and reproducible domain wall displacement by current pulses injected into ferromagnetic ring structures. , 2005, Physical review letters.