Crystal quality boosts responsiveness of magnetic shape memory single crystals

verfasst von: Katharina Rolfs, A. Mecklenburg, Jan M. Guldbakke, Robert C. Wimpory, Annika Raatz, Jürgen Hesselbach, Rainer Schneider
Abstract: Magnetic shape memory alloys are promising materials to replace giant magnetostrictive materials and piezoelectrical ceramics in actuating devices due to the large magnetically induced strains. Ni-Mn-Ga is the most intense studied system due to its relatively high operational temperatures and the huge magnetically induced strains reported. Up to now the application of these materials is still limited by the operational temperature range. Additionally twin boundary mobility suffers from structural defects increasing the magnetic fields needed for significant and reproducible strains. The sample quality is affected by crystal inhomogeneity, porosity and impurities. Here new results are reported for the Ni-Mn-Ga class based on a set of single crystals grown by the SLARE method, recently developed by Mecklenburg et al. Single crystalline samples of Ni_49.7 Mn_29.3 Ga₂₁ of tetragonal martensitic structure exhibit a magnetic field induced strain of more than 4% below 170 mT and 6.5% at only 340 mT. Furthermore the operational temperature regimen could be expanded up to 65 °C.
Externe Organisation(en): Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Technische Universität Braunschweig
Typ: Artikel
Journal: Journal of Magnetism and Magnetic Materials
Band: 321
Seiten: 1063-1067
Anzahl der Seiten: 5
ISSN: 0304-8853
Publikationsdatum: 05.11.2008
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Elektronische, optische und magnetische Materialien, Physik der kondensierten Materie
Elektronische Version(en): https://doi.org/10.1016/j.jmmm.2008.10.023 (Zugang: Unbekannt)

BibTeX

@article{b3a5f260184748b18165c812a54502c7,
title = "Crystal quality boosts responsiveness of magnetic shape memory single crystals",
abstract = "Magnetic shape memory alloys are promising materials to replace giant magnetostrictive materials and piezoelectrical ceramics in actuating devices due to the large magnetically induced strains. Ni-Mn-Ga is the most intense studied system due to its relatively high operational temperatures and the huge magnetically induced strains reported. Up to now the application of these materials is still limited by the operational temperature range. Additionally twin boundary mobility suffers from structural defects increasing the magnetic fields needed for significant and reproducible strains. The sample quality is affected by crystal inhomogeneity, porosity and impurities. Here new results are reported for the Ni-Mn-Ga class based on a set of single crystals grown by the SLARE method, recently developed by Mecklenburg et al. Single crystalline samples of Ni49.7 Mn29.3 Ga21 of tetragonal martensitic structure exhibit a magnetic field induced strain of more than 4% below 170 mT and 6.5% at only 340 mT. Furthermore the operational temperature regimen could be expanded up to 65 °C.",
keywords = "Magnetic shape memory, Neutron diffraction, Ni-Mn-Ga, Single crystal",
author = "Katharina Rolfs and A. Mecklenburg and Guldbakke, {Jan M.} and Wimpory, {Robert C.} and Annika Raatz and J{\"u}rgen Hesselbach and Rainer Schneider",
note = "Funding information: The support of this work by Deutsche Forschungsgemeinschaft (SPP1239, Grant nos. Schn 1106/1 and HE 1890/30) is gratefully acknowledged.",
year = "2008",
month = nov,
day = "5",
doi = "10.1016/j.jmmm.2008.10.023",
language = "English",
volume = "321",
pages = "1063--1067",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier BV",
number = "8",
}