Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.8: Poster
Tuesday, April 1, 2014, 13:00–15:30, P1
Influence of the antiferromagnetic bulk on exchange bias in Ni/FeF2 bilayer systems — •Henning Huckfeldt1, Ali C. Basaran2,3, Thomas Saerbeck2, Jose de la Venta2, Ivan K. Schuller2, and Arno Ehresmann1 — 1Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla, CA 92093 USA — 3Materials Science and Engineering,University of California San Diego, La Jolla, CA 92093 USA
Almost all theoretical descriptions of the exchange bias effect are based on the interaction between the ferro- and antiferromagnetic material at the interface while the bulk of the antiferromagnet is neglected.
We present a series of experiments highlighting the influence of the antiferromagnetic bulk in a Ni/FeF2 bilayer system on exchange bias. By bombardment with 9 keV He+ ions and changing penetration depths into the material system defects were created influencing the exchange bias effect. The results were confirmed by numerical simulations of the ion range and damage. Quantitative magnetic and structural characterizations were performed probing the effects of ion bombardment. It is shown that the antiferromagnetic bulk can not be neglected for a quantitative description of the exchange bias effect.