Magnetic field-induced martensitic transformation and large magnetoresistance in NiCoMnSb alloys

Abstract

Magnetic field-induced martensitic transformation was realized in Ni50−xCoxMn39Sb11 alloys. The partial substitution of Co for Ni has turned the antiferromagnetically aligned Mn moments in the starting material Ni50Mn39Sb11 into a ferromagnetic ordering, raising the magnetization at room temperature from 8emu∕g for NiMnSb to ∼110emu∕g for Ni41Co9Mn39Sb11. In the same quaternary sample, a magnetization difference up to 80emu∕g was measured across the martensitic transformation, and the transformation temperature (T0=259K) could be lowered by 35K under a field of 10T. Also a magnetoresistance over 70% was observed through this field-induced transformation.

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.…”

Magnetic Field-Induced Reverse Martensitic Transformation and Thermal Transformation Arrest Phenomenon of Ni41Co9Mn39Sb11 Alloy

“…This behavior is called the metamagnetic shape memory effect from the experimental fact that almost complete shape recovery was observed during the magnetic field-induced transformation in a Ni-Co-Mn-In specimen in which the strain had been previously introduced [4]. At the same time, as the martensitic transformation, various physical properties also drastically change, such as huge magnetoresistance [5][6][7], magnetic superelasticity [8], a large inverse magnetocaloric effect [9][10][11][12] and large change of the thermal transport properties [13][14][15]. Therefore, NiMn-based Heusler alloys have attracted interest in both scientific and applicative aspects.…”

Pressure induced magnetic and magnetocaloric properties in NiCoMnSb Heusler alloy

“…[3][4][5][6][7][8] As many of these alloys show martensitic transitions and consequently large MCE around room temperature, they can be potential candidates as room temperature magnetic refrigerants. Discovery of this new series with giant MCE has enhanced the prospect of "near room temperature magnetic refrigeration," which has emerged as an energy-efficient and ecofriendly alternative to the commonly used gas-based refrigeration technology.…”