Figure 1: Perpendicular unidirectional anisotropy with ferrimagnets.
From: Perpendicular exchange bias in ferrimagnetic spin valves
(a) Schematic view of a compensated AF interface. The interfacial energy is zero for this configuration, therefore no EB is allowed to occur. (b–d) A schematic view of a compensated hard ferrimagnetic interface in contact to a ferromagnet and a soft ferrimagnet, respectively. The larger circle designates the RE metal atom and the smaller one designates the TM atom. This interface does not exhibit frustrated bonds, leading to a maximum interfacial energy σ for EB to occur. The difference between (c) and (d) is the relative offset between the layers by one site.
