An X-ray study of non-zero nickel moment in a ferromagnetic shape-memory alloy

The existence of a magnetic moment at the nickel sites in ferromagnetic shape-memory alloys (FSMA) has long been speculated. Using a state-of-the-art X-ray magnetic circular dichroism (XMCD) technique we found that Ni 3d moments indeed exist in Ni–Mn–Ga-based FSMA. Band-structure calculations were u...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2006-08, Vol.303 (1), p.20-25
Main Authors: Islam, Zahirul, Haskel, D., Lang, J.C., Srajer, G., Lee, Y., Harmon, B.N., Goldman, A.I., Schlagel, D.L., Lograsso, T.A.
Format: Article
Language:English
Subjects:
advanced photon source
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Ferromagnetic shape-memory alloys
FERROMAGNETISM
MAGNETIC MOMENTS
Magnetic properties and materials
Martensitic transformation
Martensitic transformations
MATERIALS SCIENCE
Ni 2MnGa
NICKEL
Other ferromagnetic metals and alloys
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
SHAPE MEMORY EFFECT
Studies of specific magnetic materials
X-RAY DIFFRACTION
X-ray magnetic circular dichroism
XMCD
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Summary:The existence of a magnetic moment at the nickel sites in ferromagnetic shape-memory alloys (FSMA) has long been speculated. Using a state-of-the-art X-ray magnetic circular dichroism (XMCD) technique we found that Ni 3d moments indeed exist in Ni–Mn–Ga-based FSMA. Band-structure calculations were used to simulate the XMCD spectra and estimate this moment to be ∼ 0.33 μ B . Such a Ni moment plays a critical role in the dispersions of non-collinear spin structures, which determine the finite-temperature magnetic properties.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2005.10.245