Magnetoresistance and its relation to magnetization in Ni50Mn35Sn15 shape-memory epitaxial films

Abstract

The magnetoresistance (MR) of Heusler alloy Ni 50 Mn 35 Sn 15 epitaxial films on MgO substrates is studied as a function of temperature T and magnetic field H. The large negative MR extends over martensitic transformation with maximum of À22% at 110 K. In martensitic and austenitic phase, the MR is À3% and À5%, respectively. We show that the MR is governed mainly by magnetization paraprocess at high magnetic fields and scales as the square of magnetization DmðH; TÞ 2 . V

Field-cooled and zero-field cooled magnetoresistance behavior of Ni 2 Mn 1+x In 1−x alloys

“…7. The MR is found to vary linearly (decreasing M 2 cycle) as a function of M(H, T) 2 -M 2 S at 5 K similar to that reported for MP of Ni-Mn-Sn thin films [14]. Also, the ZFC M vs H behavior at 5 K [inset of Fig.…”

“…To further understand the origin of MR, the ZFC MR at 5 K is also fitted with the phenomenological model following Ref. [14] and is shown in Fig. 7.…”

Magnetic field dependence of electrical resistivity and thermopower in Ni50Mn37Sn13 ribbons

“…The abrupt jump of resistivity at the onset of martensitic transition was also found in Ni 50 Mn 35 Sn 15 thin film, 35 bulk Ni 2 Mn 1+x Sn 1−x (x = 0.40, 0.44) 33 and Ni 2+x Mn 1−x Ga (x = 0.24).…”

Annealing effect on the magnetic induced austenite transformation in polycrystalline freestanding Ni-Co-Mn-In films produced by co-sputtering

“…Deposition occurred at room temperature during 150 min resulting in a Ni 40. 3 field emission scanning electron microscopy (FESEM)). Sputtering was realized with an argon pressure of 8.10 À3 mbar (with a 40 Standard Cubic Centimeters per minutes (sccm) gas flowing).…”

“…Magnetic shape memory (MSM) effect, 1,2 large magnetoresistance, 3,4 piezoresistance, 5 barocaloric effect, 6 and magnetocaloric effect [7][8][9] are among the common ones. Ni-Mn-Ga system is extensively studied 10,11 since it present a reversible magnetic-field-induced strain (MFIS) that can reach up to 10%.…”