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C. Bormio-Nunes, M.A. Tirelli, R. Sato Turtelli, R. Grössinger, H. Müller, G. Wiesinger, H. Sassik, M. Reissner:
"Volume magnetostriction and structure of copper mold-cast polycrystalline Fe-Ga alloys";
Journal of Applied Physics, 97 (2005), 033901-1 - 033901-6.

Volume magnetostriction and structure of copper mold-cast polycrystalline Fe-Ga alloys

C. Bormio-Nunes and M. A. Tirelli
Departamento de Engenharia de Materiais,Faculdade de Engenharia Química de Lorena, (FAENQUIL), CP 116, 12600-970 Lorena-SP, Brazil

R. Sato Turtelli, R. Grössinger, H. Müller, G. Wiesinger, H. Sassik, and M. Reissner
Institut f. Festkörperphysik, Technische Universität Wien, Wiedner Hauptstrasse 8-10, A 1040 Vienna, Austria

(Received 12 April 2004; accepted 21 October 2004; published online 30 December 2004)

The effect of the volume expansion on the total linear magnetostriction of Fe85Ga15, Fe80Ga20, and Fe71Ga29 mold-cast bulk alloys was investigated by measuring the change in length with applied field longitudinal and perpendicular to the temperature gradient during solidification. In the magnetically saturated state, due to the contribution of the volume expansion, the saturation magnetostriction for all three alloys was about 66 % of the total linear magnetostriction. The magnetostriction is strongly dependent on the direction of the temperature gradient, being larger in this direction. The substitution of Fe by Ga atoms increases the lattice constant and causes a change to the A2 crystal structure, which was confirmed by Mössbauer spectroscopy. The thermal-expansion coefficient increases with Ga content at temperatures between 4.2 and 150 K. ©2005 American Institute of Physics

doi:10.1063/1.1834692

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937884

http://dx.doi.org/10.1063/1.1834692