The Berry Group has synthesized an unusual heterotrimetallic Mo≡Mo-Ni chain complex for which the following effect is observed: ferromagnetic alignment of δ-symmetry electrons at both the Mo2 and Ni centers arising from delocalization of a σ-symmetry electron across the Mo≡Mo-Ni chain .
Heterometallic chain compounds Mo2Ni(dpa)4Cl2 (compound 1) and [Mo2Ni(dpa)4Cl2]OTf (dpa = 2,2’-dipyridylamine) (compound 2) were prepared and studied with SQUID magnetometry.
Magnetic susceptibility data for compound 1 and 2 are shown in the figure below. The χT value for 1 at 300 K, 1.09 emu*K*mol-1, agrees with the spin-only value for an S=1 system of 1.0 emu*K*mol-1. In the case of 2 the high temperature limit in our data is 1.75 emu*K*mol-1, for which the only reasonable assignment is to an S=3/2 system (spin only value of 1.875 emu*K*mol-1). Thus, the data for 1 and 2 were modeled as S=1 or S=3/2 systems, respectively. For both 1 and 2, a sharp downward feature is seen in the χT versus T plot below 50 K, indicative of zero field splitting. The data for 1 and 2 were fitted with giso= 2.053(3); |D| =9.19(3) cm-1, and giso=1.916(3); |D| = 2.86(4) cm-1, respectively.
Thus, in reporting the first example of a one-electron oxidized Mo2MB(dpa)4Cl2 monocation in which MB represents a first-row transition metal, they find that the cation displays unusual, strongly ferromagnetic coupling affording an S=3/2 ground state that persists to room temperature. This conclusion is supported through EPR spectroscopy, SQUID magnetometry, as well as DFT computations. The ferromagnetism arises via a new mechanism in which a delocalized itinerant electron couples ferromagnetically to electrons in orthogonal orbitals in neighboring spin centers. The resulting magnitude of the coupling (J≥150 cm-1) suggests promise for the use of this effect in the design of novel magnetic materials.
Jin Group reported a method for the low pressure, low temperature synthesis of both FeGe and Fe1−xCoxGe alloys with the cubic B20 structure. AC magnetic susceptibility analysis of Fe0.95Co0.05Ge provided clear evidence for the existence of a skyrmion phase observed in any Fe1−xCoxGe alloy compound for the first time. These results not only introduce a more facile synthetic method to make high quality cubic B20 FeGe and Fe1−xCoxGe materials without the need for a high pressure apparatus but also enable the construction of Fe0.95Co0.05Ge’s magnetic phase diagram. 
 Chipman, Jill A., and John F. Berry. “Extraordinarily Large Ferromagnetic Coupling (J≥ 150 cm− 1) by Electron Delocalization in a Heterometallic Mo≣ Mo− Ni Chain Complex.” Chemistry-A European Journal 24.7 (2018): 1494-1499.
 Stolt, Matthew J., et al. “Chemical Pressure Stabilization of the Cubic B20 Structure in Skyrmion Hosting Fe1-xCoxGe Alloys.”Chemistry of Materials (2018): 1146-1154.