Large magneto-chemical-elastic coupling in highly magnetostrictive Fe-Ga alloys

Journal Article · Mon Dec 02 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4838657· OSTI ID:22253921

Wang, Gui-Sheng ^[1]; Johansson, B. ^[1]; Vitos, L. ^[1]

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1. Applied Materials Physics, Department of Material Science and Engineering, Royal Institute of Technology, Stockholm 100 44 (Sweden)

The strong softening of the tetragonal shear elastic constant (C{sup ′}) is the main reason for the second magnetostriction peak observed in Fe{sub 100–x}Ga{sub x} alloys. Here, we study the coupling between chemical order and magnetism with the aim to understand the origin of the elastic softening. We demonstrate that C{sup ′} strongly depends on the degree of order of Ga atoms in α-Fe. The B{sub 2} type ordering proves to have an important role on the elastic softening for x<19%, whereas the extreme shear lattice softening and the anomalous temperature dependence of C{sup ′} are found to be due to the strong magnetochemical coupling in the DO{sub 3} phase.

• OSTI ID: 22253921
• Journal Information: Applied Physics Letters, Vol. 103, Issue 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMS
COUPLING
MAGNETISM
MAGNETOSTRICTION
ORIGIN
PEAKS
SHEAR
TEMPERATURE DEPENDENCE