2-MM waveband EPR macrospin probe method in the investigation of viscous condensed systems

Summary form only given. The suggested macrospin probe method based on the effect of a massive paramagnetic reorientation in a strong magnetic field allows one to study various condensed systems more correctly and accurately. The reorientational effect of a single crystal of an ion-radical salt based on dibenzotetrathiafulvalene (DBTTF)/sub 3/PtBr/sub 6/ of 5.10/sup - 5/ mm/sup 3/ volume volume in the solution (1:10) of nujol and nitroxide radical (10/sup -3/ M) in tery-buthylbenzene at magnetic field of H /spl tilde =/ 5 T is considered in the terms of one-point-fixed oscillator free turn in a dissipative system. The mechanical relaxation times of the macrospin probe rotation were determined and viscosities of its environment were evaluated near the melting temperature of the model system, when the phase transition is realized. Accompanied by the microspin probe, the method was shown to give the possibility to register separately or simultaneously both elastic deformation and a viscous flow of the same -matrix at the same temperature and time. The efficienty of the method, namely sensitivity, accuracy etc., is increased with a strength of magnetic field according to H/sup 5/ power law. Therefore, 2-mm wave band EPR is the exactly appropriate technique for the detailed investigation of various properties of condensed systems.