Achieving giant magnetically induced reorientation of martensitic variants in magnetic shape-memory Ni-Mn-Ga Films by microstructure engineering

Paolo Ranzieri; Marco Campanini; Simone Fabbrici; Lucia Nasi; Francesca Casoli; Riccardo Cabassi; Elisa Buffagni; Vincenzo Grillo; Cesar Magén; Federica Celegato; Gabriele Barrera; Paola Tiberto; Franca Albertini

doi:10.1002/adma.201502072

Achieving giant magnetically induced reorientation of martensitic variants in magnetic shape-memory Ni-Mn-Ga Films by microstructure engineering

Adv Mater. 2015 Aug 26;27(32):4760-6. doi: 10.1002/adma.201502072. Epub 2015 Jul 14.

Authors

Affiliations

¹ IMEM-CNR, Parco Area delle Scienze 37/A, Parma, 43124, Italy.
² MIST E-R Laboratory, via P. Gobetti 101, Bologna, 40129, Italy.
³ Instituto de Nanociencia de Aragón, Campus Río Ebro, Calle Mariano Esquillor, 50018, Zaragoza, Spain.
⁴ INRIM, Strada delle Cacce 91, Torino, 10135, Italy.

PMID: 26180008
DOI: 10.1002/adma.201502072

Abstract

Giant magnetically induced twin variant reorientation, comparable in intensity with bulk single crystals, is obtained in epitaxial magnetic shape-memory thin films. It is found to be tunable in intensity and spatial response by the fine control of microstructural patterns at the nanoscopic and microscopic scales. A thorough experimental study (including electron holography) allows a multiscale comprehension of the phenomenon.

Keywords: electron holography; ferromagnetic shape-memory thin films; martensitic microstructure; multifunctional materials; twin variant reorientation induced by magnetic field.