Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.34: Poster
Tuesday, March 8, 2016, 09:30–12:30, Poster B1
Magnetic Imaging of Domain Wall Spin Structures in Fe Rings using SEMPA — Pascal Krautscheid1,2, •Daniel Schönke1, Maike Lauf1, Benjamin Krüger1, Robert M Reeve1, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany
For spintronic devices, a control over spin structures and an ability to manipulate magnetization dynamics is required. Here the geometrical control of the domain wall (DW) configuration in nanoscale Fe rings was investigated using scanning electron microscopy with polarization analysis (SEMPA) and micromagnetic simulations. Previous measurements for Co and Py showed a transition from a transverse to a vortex DW on increasing the ring size [1]. The observed vortex wall configuration is accessible in a large range of ring sizes in Fe, with the experimental phase boundary found to be close to the one representing the global energy minimum. It is found that the transverse wall phase boundary is shifted to smaller dimensions for Fe than for Py. For state manipulation, spin accumulation (SA) generated by electrical currents has gained interest due to possibilities for switching the magnetization state of a device. With recent work showing that such SA can be detected via X-ray imaging [2], the future application of SEMPA to image such SA is a promising avenue with the surface sensitivity of the technique expected to be advantageous [3]. [1] M. Kläui, J. Phys.: Condens. Matter 20 (2008). [2] Kukreja et al., Phys. Rev. Lett. 115, 096601 (2015).* [3] Zhang et al., Sci. Rep. 4, 4844 (2014).