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                Product Summary of Magnetic Shape Memory Material Datasheet

                Goodfellow is delighted to announce the addition of an exciting new product to our range – Magnetic Shape Memory Material. This patented NiMnGa single crystal material has some extremely innovative properties:

                Properties

                Material

                NiMnGa single Crystal

                Density

                8 g cm-3

                Melting point

                1130°C

                Elongation in Magnetic Field

                Up to 6%, typically 3 to 5%

                Response

                Up to 1 to 2 kHz

                Force Density

                About 2 MPa

                Work Output (force x stroke)

                Max 100 kJ/m3

                Fatigue Life

                Several hundred million cycles

                Magnetic Field

                <0.8T

                Maximum Operating Temperature

                45°C

                Temperature – Austenite Transformation

                50°C

                Temperature – Martensite Transformation

                50°C

                Curie Temperature

                95-105°C

                Crystallisation point

                1090°C

                Coefficient of thermal expansion

                20 x10-6 K-1 (@20-100°C)

                Thermal diffusivity

                4.4 mm2 s-1 (@ 22°C)

                Thermal conductivity

                16 W m-1 K-1 (@ 22°C)

                Electrical resistivity

                70 µOhm cm

                Temperature coefficient

                0.003 K-1

                Modulus of elasticity1

                8-20 GPa

                Hardness - Vickers

                130

                Compression stress

                >700 MPa

                Initial permeability (hard axis)

                2

                Maximum permeability (easy axis)

                90

                Coercivity, Hc

                4000 A m-1

                Activation field strength2

                150 kA m-1

                Saturation flux density2

                0.6 T

                Remanence from saturation

                0.02 T

                1 Modulus derived from the compression stress curve of the single variant sample

                2 @ 0 MPa stress

                Fast Response to Control Signal

                Strain versus field example curves at various pre-stress levels measured at 22°C

                Stress versus strain example curve measured at 22°C

                Instructions

                Please pay attention to the following instructions:

                • Do not heat the sample above 45 °C.1
                • Do not apply stresses above 5 MPa to the material1
                • Do not bend, or otherwise apply non-uniform stresses, to the material.1
                • Do not apply field or stress on the surface marked as “D” above.1
                • Apply uniform magnetic field in the direction perpendicular to the surface indicated with a blue dot.
                • We recommend recording the mechanical, thermal and magnetic history of each sample.

                1The material will not be destroyed, however it might change its twin structure. This can be easily restored by trained personnel.

                Literature

                1. E. Pagounis, Mater. Sci. Eng. R 56, 33 (2007).
                2. O. Heczko, L. Straka, J. Appl. Phys. 94, 7139 (2003).
                3. E. Pagounis, M. Laufenberg, Proceedings 12th International Conference on New Actuators, ACTUATOR 2010, pp. 731-733, 14-16.6.2010, Bremen, Germany.
                4. E. Pagounis, A. Laptev, J. Jungwirth, M. Laufenberg, M. Fonin, Scripta Mater. 88, 17 (2014).

                 

                Please click here for an introduction and applications. Alternatively, if you would like to know more about this material, please send us an e-mail or telephone us using the numbers on our contact page.

                Please click here for our standard catalogue dimensions and prices.

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