Page 319 - Read Online

Deng et al. Microstructures 2023;3:2023044 https://dx.doi.org/10.20517/microstructures.2023.42 Page 13 of 18

5g
Figure 10. (A) Variation of magnetic moment of Mn Atoms in the (111) Plane of Γ AFM Mn GaN with axial strain [23] ; (B) variation of
3
net magnetic moment and rotation angle of Mn atomic magnetic moment with axial strain for Mn GaN [23] ; (C) piezomagnetic effect
3
determined by magnetization curve in Mn Ga 0.95 N 0.94 [35] ; (D) piezomagnetic effect of in Mn Ga 0.95 N 0.94 at 130 K and 170 K [35] .
3
3

[36] [39]
Figure 11. Magnetocaloric effect of (A) Mn GaC and (B) Mn Cu N .
3 3 0.89 0.96

Barocaloric effect
A significant barocaloric effect is expected when strong cross-correlations between the volume and
magnetic order appear in materials. In 2015, Matsunami et al. reported the giant barocaloric effect enhanced
by the frustration of the AFM phase in Mn GaN . As shown in Figure 12A, when a hydrostatic pressure
[40]
3
-1
-1
change of 139 MPa is applied, Mn GaN exhibits an entropy change of 22.3 J kg K . By applying a
3
depressurization of 93 MPa, the change of adiabatic temperature is determined to be about 5 K.