The frequency dependences of the relaxation times of NMR spin echo signals of quadrupole nuclei ^{53}Cr at t_{e}=τ and t_{e}=3τ in ferromagnetic semiconductor Cd_{0.985}Ag_{0.015}Cr_{2}Se_{4} were investigated at temperature 4.2 K. It was shown that there are two kinds of the quadrupole nuclei ^{53}Cr, which have quite different relaxation times. The existence of two kinds of the nuclei ^{53}Cr was connected with doping of the cadmium selenochromite with Ag^{+} ions.
Layered high-coercive garnet films characterized by a couple of parameters very suitable for creating reconfigurable magnetic atomic traps with new properties are investigated. Non-uniform distribution of inner stresses and chemical composition stratification obtained in the films can be increased technologically to form sublayers for independent local switching by means of thermomagnetic recording. It makes possible to provide more than two magnetic states and create special types of atomic traps with additional "states of freedom". The experience in the films synthesis and experimental thermomagnetic recording for multilevel traps modeling is described.
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