Ferrimagnetic state

An example of a MOM showing ordering to a ferrimagnetic state, with a transition temperature of about 2.5 K, is [MnCp2][Ni(dmit)2] (Faulmann et al, 2003). 

A similar difficulty, which was already met in Neel s work [43], concerned with the analysis of the ferrimagnetic state, was avoided by Yafet and Kittel [44]. Their assumption, also referred to the case of negative intrasublattice interaction, is as follows. The considered sublattice actually divides up into two sublattices, moreover, each of the new sublattices is magnetized to saturation at T = 0. However, their total magnetization may acquire any intermediate value —Mo < M, < Mo, since they can be oriented at any angle to each other. Such interpretation may serve as a key to understanding the state of the sublattice in the field range hi < h < h. ... 

Below 87 K there is a further transition to a ferrimagnetic state with two inequivalent ferrous sites [11] and a complex spectrum from the two superimposed six-line hyperfine patterns is seen in Fig. 6.4. 

Phases containing the smaller lanthanoids, Dy, Ho, Er, Tm, Yb and Lu, transform to a ferrimagnetic state at approximately 7 240K for all compounds. This is due to a charge disproportionation between the transition metal cations ... 

Much of the recent work (e.g. Harris and Zobin, 1977 Chen and Lubensky, 1977 Patterson et al., 1978 Harris et al., 1978) on the magnetic phase transition in amorphous alloys has centered on the conditions under which a low-T spin-glass state is formed of the Edwards-Anderson (1975) type in place of a true ferromagnetic (or ferrimagnetic) state below T. ... 

Application of magnetic field at 2 K transforms antiferromagnetic EuSe0.95S0.05 at low internal fields (-0.9 kOe) into the ferrimagnetic state and at 1.5 kOe into the ferromagnetic state (cf. p. 206) [7]. EuSeo.sSo.i, presumably at 2.2 K, under a hydrostatic pressure of 4 kbar is said to be ferromagnetic, Schwob [12]. 

---