Figure 7: Temperature dependence of the spin current.
From: Room-temperature spin-spiral multiferroicity in high-pressure cupric oxide
The spin current is proportional to ferroelectric polarization and is given for two sets of parameters corresponding to P=0 GPa (a) and P=30 GPa (b). An increase in spin current upon decreasing temperature is an indication of the onset of a non-collinear ferroelectric phase. The decrease of spin current below a cutoff value is defined at the transition to a collinear state. We show the red horizontal line (P=0.02) as the cutoff value used for inferring TN and TL.
