The role of Fe addition on magnetic shape memory alloys: atomic distribution influence on magnetic coupling
Mangetic Shape Memory Alloys are active materials that actuate mechanically upon the application of an external magnetic field. An attractive group of MSMAs are those with a large magnetic field induced strain (MFIS), with deformations up to 12%. This MFIS is possible by the large magnetic anisotropy energy of the variants and the magnetostatic coupling between lattice and spin, allowing manipulating the crystal structure by a magnetic field. Additionally, magnetic coupling between atoms will depend on their positions within the lattice. In this proposal we aim at studying the role of iron in the magnetic and structural properties of single crystals of MSMAs with significant differences in their compositions, with the objective of elucidating how the atomic site occupancy and magnetic moment distribution affect the structural and magnetic properties of the MSMAs in simple and complex (4 and 7 element alloys) structures. Due to the high differences between the Mn, Co and Fe neutron scattering length densities, a neutron diffraction experiment in the samples proposed for this experiment will allow us to unravel with precision the atomic site occupancies in each phase of the alloys.
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PORRO AZPIAZU Jose Maria and STUNAULT Anne. (2018). The role of Fe addition on magnetic shape memory alloys: atomic distribution influence on magnetic coupling. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-391
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