Dynamics of magnetic domain wall motion after nucleation: Dependence on the wall energy

Keiki Fukumoto (1) , Wolfgang Kuch (1) , Jan Vogel (2) , Fabien Romanens (2) , Stefania Pizzini (2) , Julio Camarero (3) , Marlio Bonfim (2, 4) , Jürgen Kirschner (5)

1 FU BERLIN - Institut für Experimentalphysik
2 LLN - Laboratoire Louis Néel
3 FMC - Departamento de Fisica de la Materia Condensada [Madrid]
4 Departamento de Engenharia Elétrica
5 MPI-HALLE - Max-Planck-Institut für Mikrostrukturphysik

The dynamics of magnetic domain wall motion in the FeNi layer of a FeNi/Al2O3/Co trilayer has been investigated by a combination of x-ray magnetic circular dichroism, photoelectron emission microscopy, and a stroboscopic pump-probe technique. The nucleation of domains and subsequent expansion by domain wall motion in the FeNi layer during nanosecond-long magnetic field pulses was observed in the viscous regime up to the Walker limit field. We attribute an observed delay of domain expansion to the influence of the domain wall energy that acts against the domain expansion and that plays an important role when domains are small.

Mots clés: Domain walls; Magnetization dynamics; Magnetic imaging; PEEM

Domaines: Autre [cond-mat.other]

Keiki Fukumoto, Wolfgang Kuch, Jan Vogel, Fabien Romanens, Stefania Pizzini, et al.. Dynamics of magnetic domain wall motion after nucleation: Dependence on the wall energy. Physical Review Letters, 2006, 96, pp.097204. ⟨10.1103/PhysRevLett.96.097204⟩. ⟨hal-00018684⟩