Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Magnetic Thin Films I

MA 46.3: Vortrag

Donnerstag, 19. März 2015, 15:30–15:45, H 1012

Quantification of fluctuations of domain patterns in ultrathin ferromagnetic films — •Thomas Meier, Michael Zimmermann, Matthias Kronseder, and Christian Back — Institut für experimentelle und angewandte Physik, Universität Regensburg, Deutschland

Magnetic phase transitions in ultrathin ferromagnetic films have been subject to intensive studies in the last decades. If the magnetic film exhibits a perpendicular magnetic anisotropy either caused by surface and interface effects or magnetoelastic anisotropy due to a lattice mismatch in epitaxial growth, a spin-reorientation transition (SRT) may take place. Here the SRT of epitaxially grown Fe/Ni/Cu(001) or Ni/Fe/Cu(001) ultrathin films is investigated. We use a laboratory based imaging technique based on the threshold photoemission magnetic circular dichroism (TP-MCD) effect in combination with photoemission electron microscopy (PEEM). This technique provides a high spatial as well as high temporal resolution allowing for the observation of fluctuations of the domain pattern in real time. We quantify fluctuations of the domain pattern in the vicinity of the SRT using the magnetic susceptibility as well as the variance of the total domain wall length calculated on a sequence of images recorded at the PEEM-setup and analyzed via an automatized image processing approach. The fluctuations of the domain pattern are investigated depending on temperature and external out-of-plane magnetic fields.