SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.17: Poster
Tuesday, September 28, 2021, 10:00–13:00, P
Creation of reconfigurable stray field landscapes in synthetic antiferromagnets via focused ion beam irradiation — •Fabian Samad1,2, Gregor Hlawacek1, Sri Sai Phani Kanth Arekapudi2, Xiaomo Xu1, Leopold Koch2, Miriam Lenz1, and Olav Hellwig1,2 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institute of Physics, Chemnitz University of Technology, Chemnitz, Germany
Synthetic antiferromagnets (SAFs) with perpendicular magnetic anisotropy (PMA) can exhibit different magnetic phases depending on the magnetic history and energy balance [1]. By using focused He+ ion beam (FIB) irradiation, the antiferromagnetic (AF) interlayer exchange coupling (IEC) and PMA can be reduced on a lateral (sub-)micron scale, such that different magnetic textures can be "written" with FIB [2,3]. Due to the depth-dependent ion damage, AF domains are stabilized at low fluences, typically around 10 ions/nm2. When using a fluence gradient, the AF domains can be further manipulated in a directional fashion by applying external magnetic fields. Thus, a well-defined and reconfigurable stray field landscape is created, which can act on a suitable functional overlayer, such as a spin wave conducting or superconducting layer.
[1] Hellwig et al., J. Magn. Magn. Mater. 319, 13 (2007)
[2] Koch et al., Phys. Rev. Applied 13, 024029 (2020)
[3] Samad et al., Appl. Phys. Lett. 119 (2021)