DocumentCode
3605380
Title
Equilibrium Chemical Disorder at the Surface of a Single-Crystal 
NiMnSb Half-Heusler Alloy: Implications for Spintronics
Author
Harris, Vincent G. ; Yajie Chen
Author_Institution
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
Volume
6
fYear
2015
fDate
7/7/1905 12:00:00 AM
Firstpage
1
Lastpage
4
Abstract
The structural and chemical short-range order in a NiMnSb Heusler-type single crystal is measured using extended X-ray absorption fine structure (EXAFS). A parameterized nonlinear least squares fitting of the Ni and Mn K and Sb LI EXAFS using theoretical EXAFS data generated via a multiple scattering approximation are compared with results from neutron diffraction data. EXAFS results are consistent with a C1b structure with a quantifiable Ni-Mn chemical short-range disorder in the surface region of the Czochralski-grown single crystal that explains the often-reported low spin polarization.
Keywords
EXAFS; antimony alloys; chemical equilibrium; crystal growth from melt; ferromagnetic materials; magnetoelectronics; manganese alloys; neutron diffraction; nickel alloys; short-range order; spin polarised transport; surface segregation; Czochralski-grown single crystal; Heusler-type single crystal; NiMnSb; equilibrium chemical disorder; extended X-ray absorption fine structure; half-Heusler alloy; low spin polarization; multiple scattering approximation; neutron diffraction; short-range order; spintronics; surface region; Absorption; Chemicals; Crystals; Fitting; Manganese; Nickel; EXAFS; Heusler; Spin electronics; Spintronics; chemical disorder; spintronics;
fLanguage
English
Journal_Title
Magnetics Letters, IEEE
Publisher
ieee
ISSN
1949-307X
Type
jour
DOI
10.1109/LMAG.2015.2476778
Filename
7239565
Link To Document