Regensburg 2019 – wissenschaftliches Programm
MA 7.6: Vortrag
Montag, 1. April 2019, 16:30–16:45, H37
Investigation of focused ion beam irradiation induced magnetic spin textures in synthetic antiferromagnets — •Fabian Samad1, 2, Leopold Koch1, Sri Sai Phani Kanth Arekapudi1, and Olav Hellwig1, 2 — 1Institute of Physics, Chemnitz University of Technology, Germany — 2Institute for Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Germany
We study synthetic antiferromagnets (AF) consisting of ferromagnetic (FM) multilayers that are antiferromagnetically-coupled via non-magnetic interlayers . They possess various remarkable properties, such as very high domain wall velocities  and an absence of stray fields, making them interesting for possible future data storage applications. It was shown previously that the energy balance of those systems can be tuned by increasing the FM layer thickness, yielding a dipolar energy driven phase transition to a FM ground state .
In contrast, in our current work we use focused ion beam irradiation to locally change the energy balance between AF interlayer exchange and dipolar energy, using different ion beam energies and fluences. Therefore, we are able to create a rich variety of laterally coexisting magnetic phases and spin textures in different confinements. Detailed investigations of their interactions as well as their field reversal behavior are performed via in-field high-resolution magnetic force microscopy.
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 Yang et al., Nat. Nanotechnol. 10, 221-226 (2015).