Crystal and magnetic structure of Co Ni1-MnGe system

Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

“…This mechanism is similar to the FM exchange interaction established between Mn and Co atoms by substituting Co (µ = 1 µ B ) for Ni in MnNiGe (ref. 45). With increasing Fe content, the number of FM configurations will increase and they will overlap and form larger FM zones, in this way promoting the AFM-FM conversion in the martensite phase.…”

Structural and magnetic properties of MnCo 1−x Fe x Si alloys

“…Temperature [14,15], pressure [13,17], and magnetic field [14,18] can drive a first-order transition from an AFM to an FM state in MnCoSi-based compounds. Chemical composition change by substituting Ni for Co [19,20] or Ge for Si [18,21,22] in MnCoSi can also convert the AFM martensite to FM one. All these studies indicate that the helical non-collinear AFM state of MnCoSi martensite is instable and is inclined to be affected by different factors.…”

On the correct estimation of the magnetic entropy change across the magneto-structural transition from the Maxwell relation: Study of MnCoGeBx alloy ribbons

“…the magneto-structural transition from the FMorth phase to the PM-hex phase, in order to obtain the S T (T) curves in the MnCoGeB 0.01 ribbon sample. By choosing this transition direction, the reported magnetic field induced effect of the PM-hex to the FM-ortho phase transition [38,42] can be avoided, and therefore, only the magneto-structural transition contributes to the S T (T). In Fig.…”

“…TP-1 ( Figure 1): Let's assume that the temperature corresponding to point 1 (red solid circle [38,42]. However, in the backward direction (i.e., from orth to hex phase) no FIPT exists; accordingly, when the applied magnetic field is removed the transformed phase fraction remains (solid rhombus labelled as 2 f in figure 1(a) and 1(b)).…”

“…They found that the addition of B provokes a drastic shift of the FOPT temperature from about 650 K for the stoichiometric MnCoGe alloy, to be tuned around room temperature (between the T C values of the two allotropic MnCoGe phases) [41,42], whereas the magnetic moment per formula unit remains unaffected (3.86-3.85 µ B /f.u.) for 0.01 ≤ x ≤ 0.03.…”