Ferromagnetic chain

CsNiF3 has been widely studied by many physical methods in the temperature range between 1.2 and 300 K. It is an interesting compound since it is one of the few 1-D materials consisting of ferromagnetic chains. An extensive review article has been published by Steiner, Villain and Windsor8 so that a further amplification of the topic is unnecessary. 

Ferromagnetic chains become increasingly easier to magnetize as the temperature is lowered and their correlation length expands. Their susceptibilities increase considerably... 

For comparison to experimental data, the susceptibility of the Heisenberg S = 1/2 ferromagnetic chain in zero field can be expressed as a power series expansion in powers of J/ 2T) with the coefficients fi known for the first one hundred terms. ... 

Two excellent examples of ferromagnetic chains with measurable exchange anisotropy are the isotropic cyclohexy-lammonium copper trichloride and tribromide, CHAC and... 

Figure 19 Log-log plot of susceptibility versus temperature for four Heisenberg ferromagnetic chains. Deviations from linearity are due to interchain interactions. (Reprinted with permission from C.P. Landee and R.D. Willett, Phys. Rev. Lett., 1979, 43, 463. 1979 by the American Physical Society)...

The isostructural bromide analog CHAB also consists of ferromagnetic chains along c J/k = 55(5) K), with the easy... 

The low-temperature (10 mK < T < 20 K) thermodynamics of quinolinium (TCNQ)2 are now rather well represented by random-exchange Heisenberg anti-ferromagnetic chains (REHACs). While MP-TCNQ has similar power laws , its magnetic specific heat is quite different possibly due to facile methyl rotation about the 6-fold MP barrier . Disorder is surely important, but MP-TCNQ is complicated in this respect also. 

Photolysis of a 1 1 complex of copper(II) with 5-trimethylsilyl-l,3-phenylene-bis[diazo(4-pyridyl)methane] produces a ferromagnetic chain with an alternating array of the 3d spins of Cu(II) and the 2p spins of the quintet dicarbenes. The diazirine radioligand (34) has been synthesized as a photoaflinity probe for NADHrubiquinone oxidoreductase, to help define the structure of the pyridaben-inhibition site. ... 

---