Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 6: Mechanical Properties II

MM 6.3: Vortrag

Montag, 26. März 2012, 12:00–12:15, H 0106

Nano mechanical surface properties of the ferromagnetic shape memory alloy Ni-Mn-Ga — •Alexander Malwin Jakob and S.G. Mayr — Leibniz-Institut für Oberflächenmodifizierung, Translationszentrum für regenerative Medizin und Fakultät fuer Physik und Geowissenschaften der Universität Leipzig, 04318 Leipzig

During the last two decades, the wide field of so called "smart materials" attracted more and more interest in solid state physics. Ni-Mn-Ga, a ferromagnetic shape memory alloy (FMSM) - well known for its strong magneto-elastic coupling - yields high reversible strains up to 10% at external magnetic fields around 1 T [1]. Despite intensive investigations, nano scale processes causing magnetic shape memory effect still call for more detailed observation. Epitaxial grown 14M Ni-Mn-Ga thin films by magnetron sputtering are scope of our work. We investigate local indentation module M by means of contact resonance atomic force microscopy (CR-AFM) [2,3]. Experimental data are compared to theoretical predictions based on density functional theory (DFT). A discussion in context of super elasticity and phase transformations is given. This project is funded by the German BMBF, PTJ-BIO, Grant Number: 0313909

[1] Sozinov A., Likhachev A.A., Lanska N., and Ullakko K., Appl. Phys. Lett. Vol. 80, no. 10 (2002)

[2] Rabe U., Arnold W., Appl. Phys. Lett. Vol.64, P1493-1495 (1994)

[3] Yamanaka K., Ogiso H., Kolosov O., Appl. Phys. Lett., Vol.64, P178-180 (1994)