Hans Lüth^1,2, Detlev Grützmacher^1,5,2, Alexander Pawlis^1,5,2, and Thomas Schäpers^1,2,‡

• ¹Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
• ²JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, 52425 Jülich, Germany
• ³Department of Engineering, Reykjavik University, Menntavegur 1, IS-102 Reykjavik, Iceland
• ⁴Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
• ⁵Peter Grünberg Institut (PGI-10), Forschungszentrum Jülich, 52425 Jülich, Germany

• ^*Contact author: f.basaric@fz-juelich.de
• ^†Present address: Imec, Kapeldreef 75, 3001 Leuven, Belgium.
• ^‡Contact author: th.schaepers@fz-juelich.de