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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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