Details
| Original language | English |
|---|---|
| Pages (from-to) | 1063-1067 |
| Number of pages | 5 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 321 |
| Issue number | 8 |
| Publication status | Published - 5 Nov 2008 |
| Externally published | Yes |
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
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of Magnetism and Magnetic Materials, Vol. 321, No. 8, 05.11.2008, p. 1063-1067.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Crystal quality boosts responsiveness of magnetic shape memory single crystals
AU - Rolfs, Katharina
AU - Mecklenburg, A.
AU - Guldbakke, Jan M.
AU - Wimpory, Robert C.
AU - Raatz, Annika
AU - Hesselbach, Jürgen
AU - Schneider, Rainer
N1 - Funding information: The support of this work by Deutsche Forschungsgemeinschaft (SPP1239, Grant nos. Schn 1106/1 and HE 1890/30) is gratefully acknowledged.
PY - 2008/11/5
Y1 - 2008/11/5
N2 - 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.
AB - 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.
KW - Magnetic shape memory
KW - Neutron diffraction
KW - Ni-Mn-Ga
KW - Single crystal
UR - http://www.scopus.com/inward/record.url?scp=61649093549&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2008.10.023
DO - 10.1016/j.jmmm.2008.10.023
M3 - Article
AN - SCOPUS:61649093549
VL - 321
SP - 1063
EP - 1067
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 8
ER -