Phase diagram of magnetic domain walls in spin valve nano-stripes

Nicolas Rougemaille (1) , Vojtech Uhlir (1) , Olivier Fruchart (1) , Stefania Pizzini (1) , Jan Vogel (1) , Jean-Christophe Toussaint (1)

1 NEEL - MNM - Micro et NanoMagnétisme

We investigate numerically the transverse versus vortex phase diagram of head-to-head domain walls in Co/Cu/Py spin valve nano-stripes (Py: Permalloy), in which the Co layer is mostly single domain while the Py layer hosts the domain wall. The range of stability of the transverse wall is shifted towards larger thickness compared to single Py layers, due to a magnetostatic screening effect between the two layers. An approached analytical scaling law is derived, which reproduces faithfully the phase diagram.

Mots clés: stripe; magnetostatic coupling; Spin valve; Domain wall

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Nicolas Rougemaille, Vojtech Uhlir, Olivier Fruchart, Stefania Pizzini, Jan Vogel, et al.. Phase diagram of magnetic domain walls in spin valve nano-stripes. Applied Physics Letters, 2012, 100 (17), pp.172404. ⟨10.1063/1.4704665⟩. ⟨hal-00674182v2⟩