Abstract
The transformation of the spin structure of a high-spin Fe8 cluster in a strong magnetic field has been investigated. The magnetization and magnetic susceptibility of the material are calculated at different external magnetic fields and temperatures. It is shown that the magnetic field induces transformation of the spin structure of a Fe8 cluster from the quasi-ferrimagnetic structure with an average magnetic moment of 20 µB per molecule to the quasi-ferromagnetic structure with a magnetic moment of 40 µB. Unlike a similar transformation of a Neel ferrimagnet, which is continuous and occurs through an intermediate angular phase, this process in Fe8 at low temperatures manifests itself as a cascade of discrete quantum jumps, each being the transition accompanied by an increase in the spin number of the complex. At high temperatures, the behavior of the magnetic cluster approaches the cluster behavior described by the classical theory. The nature of quantum jumps is discussed in terms of the magnetic-field-induced energy level crossing in the ground state of a magnetic cluster.
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