Polulyakh S. Nuclear magnetic relaxation and multiquantum NMR spectroscopy of doped magnetic semiconductors and other materials

Українська версія

Thesis for the degree of Doctor of Science (DSc)

State registration number

0508U000412

Thesis Registration Form

0508U000412.pdf

Applicant for

Specialization

  • 01.04.11 - Магнетизм

03-06-2008

Specialized Academic Board

Д 26.248.01

Institute of Magnetism of the National Academy of Sciences of Ukraine and Ministry of Education and Sciences of Ukraine

Essay

The peculiarities of NMR in magnetic materials are discussed. The optimal excitation conditions and NMR spectra of multiquantum spin-echo signals from quadrupole nuclei are obtained. The thermodynamic fluctuations of electrons magnetization direction are proposed to be considered as a mechanism, which is responsible for fluctuations of both magnetic and quadrupole interactions. This mechanism is applied to the nuclei of ions, the local symmetry of which is non-cubic. The theoretical relationships for magnetic relaxation of quadrupole nuclei are obtained for the two-pulse and three-pulse spin-echo signals in magnetic materials. The analysis of spin-echo signals from quadrupole nuclei is made for a case, when the effects of the changing valency take place. The model of impure clusters is proposed to analyze MNR signals in doped magnetic semiconductors. The impure clusters are proposed to be considered as centers of fast nuclear magnetic relaxation.

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