Title :
Temperature dependence of mechanical and magnetic curves in Ni2MnGa single crystals
Author :
Sasso, Carlo P. ; Pasquale, Massimo ; Bertotti, Giorgio ; L´vov, Victor A. ; Chernenko, Volodymyr A.
Author_Institution :
IEN "Galileo Ferraris, Torino, Italy
Abstract :
The temperature dependence of magnetoelastic properties of a Ni2MnGa single crystal has been experimentally investigated through a set of magnetization versus field and stress-strain curves. The set of experimental results were analyzed using a phenomenological model which describes the twin-boundary motion as a collection of jumps affected by the magnetic field and statistically distributed pinning forces. In this framework, the observed temperature dependence of the magnetization curve shapes derives from the temperature dependence of the lattice parameters and the twin-boundary pinning force.
Keywords :
gallium alloys; lattice constants; magnetisation; magnetoelastic effects; manganese alloys; nickel alloys; stress-strain relations; twin boundaries; Ni2MnGa; Ni2MnGa single crystals; lattice parameters; magnetic curves; magnetization curve shapes; magnetoelastic properties; mechanical curves; phenomenological model; statistically distributed pinning forces; temperature dependence; twin-boundary motion; twin-boundary pinning force; Magnetic analysis; Magnetic field induced strain; Magnetic field measurement; Magnetic fields; Magnetic separation; Magnetization; Mechanical variables measurement; Strain measurement; Temperature dependence; Testing;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816163
