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

Abstract

Abstract:In order to investigate behavior of magnetic field-induced reverse martensitic transformation for Ni-Co-Mn-Sb, magnetization experiments up to a static magnetic field of 18 T and a pulsed magnetic field of 40 T were carried out. In the thermomagnetization curves for Ni41Co9Mn39Sb11 alloy, the equilibrium transformation temperature T0 was observed to decrease with increasing applied magnetic field, μ0H, at a rate of dT0/dμ0H = 4.6 K/T. The estimated value of entropy change evaluated from the Clausius-Clapeyron relation was about OPEN ACCESSMetals 2014, 4 610 14.1 J/(K· kg), which was in good agreement with the value obtained by differential scanning calorimetric measurements. For the isothermal magnetization curves, metamagnetic behavior associated with the magnetic field-induced martensitic transformation was observed. The equilibrium magnetic field, μ0H0 = (μ0HAf + μ0HMs)/2, of the martensitic transformation tended to be saturated at lower temperature; that is, transformation arrest phenomenon was confirmed for the Ni-Co-Mn-Sb system, analogous with the Ni(Co)-Mn-Z (Z = In, Sn, Ga, Al) alloys. Temperature dependence of the magnetic field hysteresis, μ0Hhys = μ0HAf − μ0HMs, was analyzed based on the model for the plastic deformation introduced by the dislocations. The behavior can be explained by the model and the difference of the sweeping rate of the applied magnetic field was well reflected by the experimental results.

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.…”

Dissipation losses limiting first-order phase transition materials in cryogenic caloric cooling: A case study on all-d-metal Ni(-Co)-Mn-Ti Heusler alloys

“…Interestingly, the chemically homogeneous single phase samples with ≥ show similar transition entropy changes Δ = Δ of approximately 65 J(kgK) -1 , even though different martensite crystal structures are present. This is evident by comparing modulated orthorhombic 4O(IC) Ni 47.9 Mn 34.2 Ti 17.9 ( = 4.37 Å, = 5.50 Å, = 4.27 Å, = 90 • , = (0, 0, 0.498) at 300 K, see supplementary material S3) with almost identical non-modulated L1 0 of Ni 33.4 Co 14.6 Mn 42.8 Ti 9.2 ( = 3.64 Å, = 7.27 Å at 296 K, see figure 1 Compared to classical Heusler alloys with an inverse magnetocaloric effect [49][50][51][52][53][54][55], compensation temperatures of 75 K and 300 K represent one of the lowest and highest values, underlining the versatility of the all-dmetal Ni(-Co)-Mn-Ti system. The compensation temperature of 300 K in Ni 33 Co 17 Mn 50-y Ti y also clearly indicates that arrested martensitic transformations are of thermodynamic and not kinetic origin.…”

“…This highly non-linear and non-monotonic shift is in contrast to the high-temperature region (90 K ≤ ≤ 150 K) in which both and shift linear towards higher magnetic fields with decreasing temperature. The broadening of hysteresis and the correlated increase of dissipation energy due to the abnormal behavior of the starting point of the field-induced transition from hightemperature to low-temperature phase upon field removal at ≤ appears to be a general feature for a variety of magnetocaloric materials, such as classical Ni-Mn-based Heusler alloys [50][51][52] and Fe-Rh [34].…”

“…The opposing positive lattice and negative magnetic entropy change contributions give rise to the "dilemma of inverse magnetocaloric materials" [49] and are compensated at the compensation temperature , below which the martensitic transformation is thermally arrested due to the absence of a driving force. In the literature, this thermodynamic effect is often called kinetic arrest and is described in multiple classical Ni(-Co)-Mn-X Heusler alloys with X being a main group element, namely Sn [50], Sb [51], Al [52] and In [49,[53][54][55]. However, the arrest phenomenon is not only limited to Heusler alloys but also appears in other inverse magnetocaloric materials, such as Fe-Rh compounds [34].…”

Defect induced ferromagnetism in Mn3Ga

“…Apart from these exciting functionalities, antiferromagnets also provide for investigating basic physical phenomena such as kinetic arrest [13][14][15], intrinsic exchange bias [16][17][18], magnetic proximity effect [19], shell ferromagnetism [20], etc. These intriguing properties are also related to magnetic inhomogeneities consisting of AF and FM regions that are exchange-coupled at their interface.…”