Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
DS: Fachverband Dünne Schichten
DS 44: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)
DS 44.13: Talk
Friday, March 20, 2020, 12:45–13:00, HSZ 04
Growth, structure, and magnetic properties of artificially layered NiMn in contact to ferromagnetic Co on Cu3Au(001) — •Tauqir Shinwari1, Ismet Gelen1, Melek Villanueva2, Yasser A. Shokr1,3, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Division of Permanent Magnets and Applications, IMDEA Nanoscience, 28049, Madrid, Spain — 3Faculty of Science, Department of Physics, Helwan University, 17119 Cairo, Egypt
A series of experiments is carried out to identify the fundamental mechanisms leading to the exchange-bias effect in ultrathin epitaxial layered ferromagnetic/antiferromagnetic (FM/AFM) samples on Cu3Au(001). The studied samples are single-crystalline antiferromagnetic artificially layered [Ni/Mn] films covered by ferromagnetic Co layers, deposited under ultrahigh-vacuum conditions. The approach is to study the structural and magnetic properties of artificially ordered layers of Ni and Mn in contact to Co by using low-energy electron diffraction (LEED) and magneto-optical Kerr effect, respectively, and comparing with disordered NixMn1−x alloy films with the same Ni/Mn ratio and the same film thickness. We found from LEED I(V) curves that the perpendicular interatomic lattice distance is decreased in the artificially layered [Ni/Mn] samples in comparison to the disordered NixMn1−x alloy films. This change in the structure causes higher coercivity, exchange bias, and stronger exchange coupling in artificially layered [Ni/Mn] samples compared to disordered NixMn1−x alloy films.