Journal article
Coupling of micromagnetic and structural properties across the martensite and curie temperatures in miniaturized Ni-Mn-Ga ferromagnetic shape memory alloys
AM Jakob, M Hennes, M Müller, D Spemann, SG Mayr
Advanced Functional Materials | Wiley | Published : 2013
Abstract
Micromagnetic structure evolution in Ni-Mn-Ga ferromagnetic shape memory thin films is investigated by means of temperature dependent magnetic force microscopy (TD-MFM). The center of interest is the magnetic properties of epitaxial Ni-Mn-Ga thin films on MgO substrates across thermally induced phase transitions. Experimental results are discussed within the framework of competing magnetic interactions arising in stressed thin ferromagnetic films. Measurements on 14M martensite specimens are supplemented by three-dimensional micromagnetic simulations. Corresponding calculated MFM micrographs are compared to experimental data. The influence of twin variant dimension and orientation on microma..
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Awarded by German Federal Ministry of Education and Research (BMBF), PtJ-Bio
Awarded by SAW award of the German Leibniz Association
Funding Acknowledgements
We appreciate the general support of Prof. B. Rauschenbach. Furthermore, we owe thank to F. Schmidt and Prof. M. Grundmann (Semiconductor Physics Group, Faculty of Physics and Earth Sciences, University of Leipzig) for conducting initial TDRC. Our gratitude is expressed to Dr. M. J. Donahue (Mathematical & Computational Sciences Division at NIST, Gaithersburg) for considerate initial support concerning OOMMF simulations. Useful discussions with A. Landgraf and J. Buchwald are gratefully acknowledged. This work was funded in parts by the German Federal Ministry of Education and Research (BMBF), PtJ-Bio, 1315883, the Leipzig Graduate School of Natural Sciences BuildMoNa established by the German Science Foundation (DFG) and the SAW award of the German Leibniz Association (SAW-2011-IOM-2).