Dresden 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 18: Magnetic Coupling Phenomena
MA 18.6: Talk
Tuesday, April 1, 2014, 15:15–15:30, HSZ 403
Thickness dependent exchange bias in martensitic phase of Ni-Mn-Sn thin films — •Anna Behler1,2, Niclas Teichert3, Biswanath Dutta4, Anja Waske1, Tilmann Hickel4, Alexander Auge3, Andreas Hütten3, and Jürgen Eckert1,5 — 1IFW Dresden, Institute for Complex Materials, 01171 Dresden, Germany — 2Department of Physics, Institute for Solid State Physics, Dresden University of Technology, 01062 Dresden, Germany — 3Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, 33501 Bielefeld, Germany — 4Max-Planck Institut für Eisenforschung, 40237 Düsseldorf, Germany — 5Institute of Materials Science, Dresden University of Technology, 01062 Dresden, Germany
In the low temperature martensitic phase of epitaxial Ni-Mn-Sn thin films we found an exchange bias (EB) effect after field cooling and zero field cooling (ZFC) the system. The high values of the thickness dependent EB after ZFC can be retained down to very small thicknesses. In comparison for a Ni-Mn-Sn thin film, which differs in composition and therefore does not undergo a martensitic transition, no exchange bias is observed. The EB behavior is attributed to the unidirectional anisotropy due to the coupling between ferromagnetic (FM) and antiferromagnetic (AFM) interactions. Our magnetization measurements suggest that a significant interplay between FM and AFM regions is only present in the low temperature martensitie. This is qualitatively supported by ab initio calculations showing the AFM order is stabilized in this phase compared to the austenitic state. Particular attention is paid to the need of the martensitic phase of Ni-Mn-Sn for EB.