Magnetic structure ferromagnetic

Elmore, W.C. (1938) Ferromagnetic colloid for studying magnetic structures. Physical Review, 54, 309-310. 

Figure S6.1 Magnetic structures (a) paramagnetic solid, (b) ferromagnetic ordering, (c) antiferromagnetic ordering, and (d) ferrimagnetic ordering. The magnetic dipoles on atoms are represented by arrows.

The occurence of the magnetic structure of the A-type also demands a 3-dimensional linking of octahedra in corners. The magnetic coupling, however, is of a different kind in the 3 directions The A-type is a magnetic layer structure, in which ferromagnetic sheets are coupled anti-ferromagnetically in the third direction. 

In the preceding section, the magnetic field was mainly used to determine the saturation magnetization of ferromagnets. However, it is now well established that many actinide compounds have complex magnetic behaviour and the application of an external field may change or suppress antiferromagnetic structures. 

Mukhin et al. (2000) found that increasing Sr doping in Lai- Sr MnOs does suppress the (quasi-)ferromagnetic resonance frequency, whereas the (quasi-)AF resonance frequency is only slightly decreased (20%). This behaviour corresponds to a canted magnetic structure and its evolution with increasing x. 

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