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MA: Fachverband Magnetismus

MA 39: Magnetic Thin Films

MA 39.4: Vortrag

Donnerstag, 20. März 2025, 16:00–16:15, H19

Double Exchange Bias (EB) Effects in IrMn/CoFe/IrMn Systems — •Arne Vereijken, Varun Vanakalapu, Rico Huhnstock, and Arno Ehresmann — Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Kassel, Germany

The EB effect, characterized as an unidirectional anisotropy in a ferromagnet (FM) coupled to an antiferromagnet (AFM) through a shared interface[1], is utilized in Lab-on-Chip (LOC) systems[2], among other technologies. In LOC systems, it is combined with ion bombardment induced magnetic patterning (IBMP) to engineer magnetic stray field landscapes (MFLs)[2]. This work demonstrates that adding a second EB interface to the same FM adds a degree of freedom for tailoring MFLs, achieving stronger and steeper stray field gradients beneficial for LOC applications. Whether the two EBs are independent of each other, particularly when aligned parallel or at an angle, poses an intriguing question. Investigations using vibrating sample magnetometry and magneto-optical Kerr effect measurements and comparisons with advanced EB models tailored for polycrystalline systems and the specific measurement conditions[3], reveal that the EB strength in the employed Ir17Mn83/Co70Fe30/Ir17Mn83 systems slightly exceeds twice that of single EB systems. This is attributed to additive, mostly independent EBs, making the second EB a great candidate for refining MFL engineering. [1] Meiklejohn, W. H. et al. (1956). Phys. Rev. 102, 1413 [2] Holzinger, D. et al. (2015). ACS Nano 9 (7), 7323-7331 [3] Merkel, M. et al. (2022). Phys. Rev. B 106, 014403

Keywords: Exchange Bias; Magnetic Domain Patterning; Stray Field Landscape