Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Non-Skyrmionic Magnetic Textures
MA 55.6: Talk
Thursday, March 19, 2020, 16:30–16:45, POT 6
Domain formation and domain wall motion in synthetic antiferromagnets controlled by focused ion beam irradiation — •Fabian Samad1,2, Leopold Koch2, Gregor Hlawacek1, Sri Sai Phani Kanth Arekapudi2, Miriam Lenz1, and Olav Hellwig1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Chemnitz University of Technology, Chemnitz, Germany
By tuning the energy landscape of layered synthetic antiferromagnets (SAFs) with perpendicular anisotropy, a great variety of magnetic phases can be stabilized, as was shown previously by changing the layer thicknesses and repetition numbers [1]. Here, in contrast, we use focused He+ ion beam irradiation in order to controllably and locally change the energy balance, giving rise to laterally coexisting magnetic textures. Using intermediate He+ ion fluences, we achieve a phase transition to ferromagnetic stripe domains. For low He+ ion fluences, an antiferromagnetic (AF) remanent domain is nucleated, stabilized with an inverse magnetization structure as compared to the naturally preferred non-irradiated AF remanent state, thus allowing us to write well defined AF domains on the nanoscale into our SAF system. When exposed to an external out-of-plane magnetic field, structures irradiated with a fluence gradient exhibit a continuous domain annihilation from the high to the low fluence region. This could be utilized for engineering a controllable and local stray field landscape within the stray field free environment provided by the as prepared SAF ground state. [1] Hellwig et al., J. Magn. Magn. Mater. 319, 13-55 (2007).