A switch-like magnetoresistance of ferromagnetic Ni–Mn–Ga ribbon during martensitic transformation.

The Ni 53 Mn 23.5 Ga 23.5 ribbon was fabricated by a process of melt-spinning. The structure and magnetic properties of the as-spun and annealed ribbons were investigated. The magnetoresistance (MR) was evaluated at the magnetic field up to 30 kOe. A switch-like (negative and positive) MR (about 2%) obtained at a martensitic transformation (MT). Due to the lattice instability and magnetocrystalline anisotropy, the highly textured Ni 53 Mn 23.5 Ga 23.5 melt spun ribbons may be broadly applied in magnetic memory applications, also as a temperature and the magnetic sensor. [ABSTRACT FROM AUTHOR]