1 M.Rotter „Magnetostriction“ Course Lorena 2007 New Topics Fe-Ga Magnetic Shape Memory Effect Gd Compounds, Gd-Si RE Metals Sm, Tm MEP.

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Presentation transcript:

1 M.Rotter „Magnetostriction“ Course Lorena 2007 New Topics Fe-Ga Magnetic Shape Memory Effect Gd Compounds, Gd-Si RE Metals Sm, Tm MEP

2 M.Rotter „Magnetostriction“ Course Lorena 2007 FeGa ? Lattice parameter plots of solute element content in Fe: ( ) Fe–Al alloys, ( ) Fe–Be alloys, and (×) Fe–Ga alloys Magnetostriction curves of (a) Fe–15 at. % Ga, directionally cast (DS) and heat treated at 600 °C for 1 h and (b) Fe–15 at. % Ga–5 at. % Al, directionally cast (DS) and heat treated at 1100 °C for 1 h and 730 °C for 1 h N. Srisukhumbowornchai and S. Guruswamy Journal of Applied Physics 90( 2001) 5680

3 M.Rotter „Magnetostriction“ Course Lorena 2007

4 R. Grössinger, R. Sato, H. Müller, S. Heiss, 2006

5 M.Rotter „Magnetostriction“ Course Lorena 2007 Magnetic Shape Memory Effect Principle of magnetic field induced re- orientation of martensitic variants. Ferromagnetic shape memory alloys (FSMA) are smart materials possessing not only ferromagnetic as well as thermal shape memory properties but also large magnetic field induced strains. In single crystalline Ni 2 MnGa bulk material, strains as large as 10% have been realized.

6 M.Rotter „Magnetostriction“ Course Lorena 2007 Gd 5 (Si x Ge 1-x ) 4 Morellon et. al O(II)O(I) T N = 127 K T C = 81 K

7 M.Rotter „Magnetostriction“ Course Lorena 2007 Samarium K. McEwen et al. J. Phys. F: Metal Phys.4 (1974) 2264 Magnetization

8 M.Rotter „Magnetostriction“ Course Lorena 2007 Samarium Thermal Expansion

9 M.Rotter „Magnetostriction“ Course Lorena 2007 Samarium Magnetostriction

10 M.Rotter „Magnetostriction“ Course Lorena 2007 Tm.... Strongly anisotropic Systems have to be measured with great care !!! From Zochowski et al.[cap dilatometry J. Magn. Magn. Mat , 1515 (1992). ]. ? T N =54K

11 M.Rotter „Magnetostriction“ Course Lorena 2007 Forced magnetostriction of Tm a single crystal. Circles represent the data measured by Zochowski et al.[cap dilatometry J. Magn. Magn. Mat , 1515 (1992). ]. Squares represent the data obtained by Barcza. [TU Vienna]. Crosses represent the neutron diffraction data obtained at IN12. Triangles the data obtained by A. Lindbaum glueing the sample [TU Vienna]. Tm