Volume 85, Number 5, March 2009
Article Number 57006
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 19 March 2009
EPL, 85 (2009) 57006
DOI: 10.1209/0295-5075/85/57006

Continuous Néel-to-Bloch transition in strips whose thickness increases: Statics and dynamics

K. Rivkin1, K. Romanov2, Y. Adamov2, A. Abanov2, V. Pokrovsky2 and W. M. Saslow2

1   Seagate Technology - Bloomington, MN 55435, USA
2   Department of Physics, Texas AM University - College Station, TX, 77843, USA

received 12 December 2008; accepted in final form 17 February 2009; published March 2009
published online 19 March 2009

For strips of width 2w and height h, with both exchange and the dipole-dipole interaction, we find that Néel and Bloch domain walls are locally stable. As h is increased to hc, Néel walls evolve continuously to Bloch walls by a second-order transition. It is mediated by a critical mode with $\omega\sim\sqrt{h_c-h} $, corresponding to motion of the domain wall center. A uniform out-of-plane rf-field couples strongly to this critical mode only in the Néel phase. Local, but not global stability relative to a crosstie phase was established.

75.60.Ch - Domain walls and domain structure.
75.70.Ak - Magnetic properties of monolayers and thin films.

© EPLA 2009