Title :
Influence of thermal treatment on local structure and magnetic properties of NiMnGa alloys
Author :
O´Connor, C.J. ; Golub, V.O. ; Vovk, A.Ya. ; Kotov, V.V. ; Yakovenko, P. ; Ullakko, K.
Author_Institution :
AMRI, New Orleans Univ., LA, USA
Abstract :
Summary form only given. Nearly stoichiometric Ni/sub 2/MnGa alloys with martensitic structure exhibit a magnetic shape memory (MSM) effect caused by activation of twin boundary motion in magnetic field. The field-induced reorientation of martensite can cause more than 4% length variation. The effect strongly depends on alloys composition and structure. Due to the complex structure of martensitic phase the interpretation of the results obtained by x-ray diffraction is ambiguous. Moreover optimum MSM effect could be expected for metastable state. Thus the microstructure of the alloys should be controlled.
Keywords :
X-ray diffraction; crystal microstructure; exchange interactions (electron); ferromagnetic materials; gallium alloys; manganese alloys; martensitic structure; nickel alloys; spin dynamics; stoichiometry; twin boundaries; Ni/sub 2/MnGa; Ni/sub 2/MnGa alloys; field-induced reorientation; local structure; magnetic properties; martensitic phase; thermal treatment; twin boundary motion; x-ray diffraction; Anisotropic magnetoresistance; Annealing; Frequency; Lakes; Magnetic anisotropy; Magnetic properties; Materials science and technology; Nuclear magnetic resonance; Perpendicular magnetic anisotropy; Shape memory alloys;
Conference_Titel :
Magnetics Conference, 2002. INTERMAG Europe 2002. Digest of Technical Papers. 2002 IEEE International
Conference_Location :
Amsterdam, The Netherlands
Print_ISBN :
0-7803-7365-0
DOI :
10.1109/INTMAG.2002.1000634
