Ol'khovik L. The evolution of magnetic properties of high anisotropic ferrimagnetics BaFe12O19 at transition from macro- to nanocrystal

Українська версія

Thesis for the degree of Doctor of Science (DSc)

State registration number

0506U000597

Thesis Registration Form

0506U000597.pdf

Applicant for

Specialization

  • 01.04.11 - Магнетизм

06-10-2006

Specialized Academic Board

Д 64.051.03

V.N. Karazin Kharkiv National University

Essay

Research object: nano- and microcrystals model systems of the barium hexaferrite. Aim: solution of the problem of definition of fundamental mechanisms to determine magnetic properties of crystals of high anisotropic ultra small ferrimagnet. Methods: the electronics microscopy, the X-ray photo electronics and depth selective Mossbauer spectroscopy, traditional magnetic methods of measurements. Results, novelty: the new physical-chemical principles of hexaferrite nano- and micro crystals synthesis are proposed and approbated; the extremely small depth of cloze to surface area of crystals and the mean angle of magnetic moments bevel in it for the range 300-730 K are determined; the surface anisotropy contribution on the temperature dependence of effective magnetic anisotropy is determined; (H-T) diagram magnetic states of system of barium ferrite nano crystals in manifestation context of the dimensional and collective effects is constructed Field of implementation: physics of magnetic phenomenon

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