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 MPato 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

E. Pagounis, Mater. Sci. Eng. R 56, 33 (2007).
O. Heczko, L. Straka, J. Appl. Phys. 94, 7139 (2003).
E. Pagounis, M. Laufenberg, Proceedings 12^th International Conference on New Actuators, ACTUATOR 2010, pp. 731-733, 14-16.6.2010, Bremen, Germany.
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.