Figure 4.

The large thermal irreversibility can be overcome by the combination of applied magnetic and mechanical forces. M–T curves under 0 and 1.3 kbar hydrostatic pressure at 308 K are shown for Ni_45.2Mn_36.7In₁₃Co_5.1. The bottom right corner inset shows the shift of martensitic transition temperatures by the application of a hydrostatic pressure up to 4.3 kbar. The forward and reverse transitions can be induced in a relatively low field (with little hysteresis—shaded region in the main figure) when the sample is magnetized in zero pressure but demagnetized under an external pressure. This process is also demonstrated schematically (originally published in [60]).