MAGNETOCRYSTALLINE ANISOTROPY AND SPINORIENTATION PHASE TRANSITIONS OF [Co.sub.2]Z HEXAFERRITE DOPED WITH [Ti.sup.4+] AND [Zn.sup.2+] IONS

• Published in: Russian physics journal Vol. 62; no. 10; p. 1926
• Main Authors: Zhuravlev, V.A, Zhuravlev, A.V, Atamasov, V.V, Malenko, G.I
• Format: Journal Article
• Language: English
• Published: Springer 01.02.2020
• Subjects: Anisotropy; Ferromagnetism; Magnetization; Permeability; Zinc compounds
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-020-01924-9

The paper presents the methodology for calculation of ferromagnetic resonance spectra of polycrystalline and powder hexaferrites with easy magnetization plane. Magnitudes of magnetocrystalline anisotropy fields and magnetomechanical ratios of the hexaferrites of [Ba.sub.3][Co.sub.1.5+x][Ti.sub.x][Fe.sub.24.5-2x][O.sub.41] (0.0 [less than or equal to] x [less than or equal to] 1.0) and [Ba.sub.3][Co.sub.2.5-x][Zn.sub.x][Ti.sub.0.5][Fe.sub.23][O.sub.41](0.0 [less than or equal to] x [less than or equal to] 1.2) (0.0 [less than or equal to] x [less than or equal to] 1.2) systems were determined from an experimental study of the parameters of ferromagnetic resonance at room temperature. The study of temperature dependences of initial magnetic permeability was used to determine the temperatures of spin-orientation phase transitions of these materials. It was shown that substitution of [Co.sup.2+][Ti.sup.4-] complex for [Fe.sup.3+] ions leads to the widening of the temperature region of existence for the magnetic ordering of the easy magnetization plane type with high magnetic permeability in the microwave frequency region. Substitution of [Zn.sup.2+] ions for some of the [Co.sup.2+] ions increases the saturation magnetization. Keywords: hexagonal ferrimagnetic material, ferromagnetic resonance, magnetocrystalline anisotropy, spin-orientation phase transitions, saturation magnetization.