Domain wall structure in magnetic bilayers with perpendicular anisotropy
Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502 - 91405 Orsay Cedex, France, EU
2 Laboratoire PMTM, Univ. Paris 13, CNRS UPR 9001 - 93430 Villetaneuse, France, EU
Accepted: 1 July 2010
We study the magnetic domain wall structure in magnetic bilayers (two ultrathin ferromagnetic layers separated by a non-magnetic spacer) with perpendicular magnetization. Combining magnetic force and ballistic electron emission microscopies, we are able to reveal the details of the magnetic structure of the wall with a high spatial accuracy. In these layers, we show that the classical Bloch wall observed in single layers transforms into superposed Néel walls due to the magnetic coupling between the ferromagnetic layers. Quantitative agreement with micromagnetic calculations is achieved.
PACS: 75.60.Ch – Domain walls and domain structure / 75.70.-i – Magnetic properties of thin films, surfaces, and interfaces / 68.37.Ef – Scanning tunneling microscopy (including chemistry induced with STM)
© EPLA, 2010