National University of Science and Technology MISiS

V. G. Kostishyn, A. T. Morchenko, D. N. Chitanov

Research and Practical Materials Science Center, Solid State and Semiconductor Physics Institute, national Academy of Sciences of Belarus, Republic of Belarus

V. M. Truhan

Results of studying coercive force, optical absorption and lattice mismatch in single−crystal epitaxial magnetic garnet films are presented. It is shown that the reason of high values of both coercivity and optical absorption are the oxygen vacancies compensating Ca²⁺ ions and lattice mismatch stress. Methods of inducing high−coercivity state in Bi−containing garnet films through doping by bivalent impurity ions, through mismatch stress or through treatment in negative corona discharge are proposed. Merits and demerits of these methods are discussed and their comparison is carried out.

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