Stable Magnetic-Field-Induced Strain Above 1% in Polycrystalline Ni–Mn–Ga
Polycrystalline Ni–Mn–Ga samples were directionally solidified and trained in order to lower the twinning stress. Polyurethane was used to fill the cracks. Magnetic-field-induced strain (MFIS) was measured in a rotating magnetic field over more than 106 cycles. The operating temperature was varied between 0 and 45 °C. With increasing temperature, the MFIS increased from 0.6% to 1.2%. After cooling to room temperature, an enhanced MFIS of 1.0% was retained and maintained over another 106 cycles.
Gaitzsch, Uwe; Romberg, Jan; Pötschke, Martin; Roth, Stefan; and Müllner, Peter. (2011). "Stable Magnetic-Field-Induced Strain Above 1% in Polycrystalline Ni–Mn–Ga". Scripta Materialia, 65(8), 679-682. http://dx.doi.org/10.1016/j.scriptamat.2011.07.011