Magnetic metamagnetic

As can be expected from the EO coordination mode of the azido ligand, all these complexes show ferromagnetic coupling. The field dependence of the magnetization in the low temperature region has been interpreted as indicative of metamagnetic behavior. 

MM (metamagnet), AF (antiferromagnet), SF (spin-flop), Frust. Mgn. (frustrated magnet) and FIM (ferrimagnet) ... 

With a few exceptions, the crystal structure of the salts based on the type I mixed chains consists of parallel arrangements of those chains. In most cases the magnetic behavior of these salts is dominated by ferromagnetic (FM) interactions, due to intrachain D+ A coupling. Several of these salts exhibit metamagnetic (MM) behaviors due to the coexistence of weaker antiferromagnetic (AF) intrachain interactions. 

The magnetic behavior of [Fe(C5Me4SCMe3)2][M(mnt)2] (M = Ni, Pt) is dominated by FM interactions (6 — 3 K, M = Ni and Pt), which can be attributed to the D+A intrachain interactions. The weaker interchain interactions are expected to be AF. As in the previous compounds exhibiting this type of structure a metamagnetic behavior is also expected to occur at low temperatures. 

Fig. 36. Metamagnetic transitions measured on a TbNi2B2C single crystal, at 2 K. Field H and measured component of magnetization M are within the tetragonal basal plane. 0-angle with respect to the a-axis (after...

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