Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.42: Poster
Dienstag, 8. März 2016, 09:30–12:30, Poster B1
Antiferromagnetic properties of Mn2Au thin films and exchange bias of Fe/Mn2Au heterostructures — •Alexey Sapozhnik1,2, Simone Finizio3, Radu Abrudan4, Anton Devishvili5, Mathias Kläui1, Hans-Joachim Elmers1, Hartmut Zabel1, and Martin Jourdan1 — 1Institut für Physik, JG Universität, Mainz, Germany — 2MAINZ Graduate School, Germany — 3PSI, Switzerland — 4HZB, Germany — 5Uppsala University, Sweden
Large efforts are being made to implement spintronic devices based on antiferromagnets (AFM). Metallic AFMs such as Mn2Au are attractive because of their potential manipulation via currents. Here we report magnetic properties of Mn2Au and Fe/Mn2Au revealed by MOKE, resonant magnetic x-ray and polarized neutron techniques. X-PEEM on high-quality epitaxial Fe/Mn2Au (001) films exhibits ~1mkm size Fe domains imprinted by AFM domains in Mn2Au. Mn-L3 XMLD suggests that these domains are preferentially oriented along the in-plane [110] AFM easy axis. However, the very high Néel temperature prevents the domain distribution manipulation. To overcome these problems, Fe/Mn2Au films were deposited at lower substrate temperature, which effectively decreases the crystal grain size and lowers the Néel temperature. Upon field cooling a significant exchange bias effect is observed, in contrast to heterostructures grown at higher temperatures. Temperature dependent hysteresis loops exhibit asymmetric reversal behavior. Polarized neutron reflectivity confirms domain wall motion at negative coercivity, but partial rotation at positive coercivity.