Metamagnetic shape memory effect in a Heusler-type Ni43Co7Mn39Sn11 polycrystalline alloy

Abstract

Shape memory and magnetic properties of a Ni43Co7Mn39Sn11 Heusler polycrystalline alloy were investigated by differential scanning calorimetry, the sample extraction method, and the three-terminal capacitance method. A unique martensitic transformation from the ferromagnetic parent phase to the antiferromagneticlike martensite phase was detected and magnetic-field-induced “reverse” transition was confirmed in a high magnetic field. In addition, a large magnetic-field-induced shape recovery strain of about 1.0% was observed to accompany reverse martensitic transformation, and the metamagnetic shape memory effect, which was firstly reported in a Ni45Co5Mn36.7In13.3 Heusler single crystal, was confirmed in a polycrystalline specimen.

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

“…2.3(c). In quaternary systems such as Ni-Co-Mn-In [58,65,66,[97][98][99][100][101], Ni-Co-Mn-Sn [15,101,102], Ni-CoMn-Sb, [101,103,104], Ni-Co-Mn-Al [17,46,[105][106][107] and Ni-Co-Mn-Ga [16,[108][109][110], the same relationship of ΔM as well as MFIT have been found. It should be noted that in most of the above cited studies, magnetization was monitored for the detection of MFIT.…”

“…This group of alloys are called metamagnetic shape memory alloys (MMSMA). Substitutional Ni-Mn-based alloy systems such as Ni-Co-Mn-Sn [15], Ni-Co-Mn-Ga [16] and Ni-Co-Mn-Al [17], ferrous systems such as Fe-Mn-Al [18], Fe-Mn-Ga [19] and Fe-Mn-Al-Ni [20], as well as cobalt based Co-Cr-Ga-Si alloys [21] have been reported. In these alloys, there is a strong output stress during the a Corresponding author's e-mail: kainuma@material.tohoku.ac.jp MFIT [22][23][24] though a strong magnetic field is needed for the realization of MMSMA.…”

Large magnetocaloric effects in magnetic intermetallics: First-principles and Monte Carlo studies

“…There are ferromagnetic spin clusters of nanoscopic dimensions with center-to-center spacing around 12 nm [25]. This is the origin of metamagnetic behavior since a magnetic field applied to martensite can yield a first order transition to the ferromagnetic austenitic phase (see, for example, [28]). When adding Co to the Heusler alloys for getting better magnetocaloric effects, the magnetostructural transition is shifted to lower temperatures because of decrease of e/a and eventually the martensitic phase vanishes altogether for larger Co concentration.…”

Effect of partial substitution of Ni by Co on the magnetic and magnetocaloric properties of Ni50Mn35In15 Heusler alloy

“…It was reported earlier that the DS M and net RC [after accounting for hysteresis loss (HL)] of Ni 50 Mn 35 In 15 in the vicinity of the first-order transition (FOT) and second-order transition (SOT) were, respectively, 35 J kg À1 K À1 , 57 J/kg, and À5.7 J kg À1 K À1 , 123 J/kg for DH ¼ 5 T. 2 Recent studies show that substitution of Ni by Co in Ni 2 Mn 1þy X 1Ày strongly affects the magnetic, magnetocaloric, and magnetoelastic properties. [3][4][5][6] However, additional studies are required to fully evaluate the MCE properties of Ni-Co-Mn-In. In this study, we report a detailed study of the MCE (DS M , DT ad , RC, and HL) for the partial substation of Ni by Co in Ni 50 Mn 35 In 15 using magnetization and heat capacity measurements.…”