Magnetic and absorbing properties of M-type substituted hexaferrites BaFe{sub 12–x}Ga{sub x}O{sub 19} (0.1 < x < 1.2)

Journal Article · Thu Sep 15 04:00:00 EDT 2016 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776116090089· OSTI ID:22617184

Trukhanov, A. V. ^[1]; Kostishin, V. G.; Panina, L. V. ^[2]; Kazakevich, I. S. ^[1]; Turchenko, V. A. ^[3]; Oleinik, V. V.; Yakovenko, E. S.; Matsui, L. Yu. ^[4]

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1. National Academy of Sciences of Belarus, Scientific-Practical Materials Research Centre (Belarus)
2. National University of Science and Technology MISiS (Russian Federation)
3. Joint Institute for Nuclear Research (Russian Federation)
4. Taras Shevchenko National University of Kyiv (Ukraine)

X-ray powder diffraction is used to determine the unit cell parameters and to refine the crystal structure of the solid solutions of M-type hexagonal barium ferrite BaFe{sub 12–x}Ga{sub x}O{sub 19} (x = 0.1–1.2) with isostructural diamagnetic cation Ga{sup 3+} substitution at T = 300 K. As the level of substitution increases, the unit cell parameters are shown to decrease monotonically. The temperature (300 K ≤ T ≤ 750 K, H = 8.6 kOe) and field (T = 300 K,–20 kOe ≤ H ≤ 20 kOe) dependences of the saturation magnetization of these solid solutions are studied with a vibrating-sample magnetometer. The concentration dependences of the Curie temperature T{sub C}, the specific spontaneous magnetization, and the coercive force are plotted. The magnetic parameters are found to decrease with increasing substitution. The microwave properties of the solid solutions are analyzed in an external magnetic field (0 ≤ H ≤ 4 kOe). As the cation Ga{sup 3+} concentration increases from x = 0.1 to 0.6, the natural ferromagnetic resonance (NFMR) frequency decreases; as the concentration increases further to x = 1.2, this frequency again increases. As the cation Ga{sup 3+} concentration increases, the NFMR line width increases, which indicates a widening of the frequency range where electromagnetic radiation is intensely absorbed. Here, the resonance curve peak amplitude changes insignificantly. The shift of the NFMR frequency in an applied magnetic field is more pronounced for samples with low cation Ga{sup 3+} concentrations. The role of diamagnetic substitution is revealed, and the prospects and advantages of Ga-substituted beryllium hexaferrite as the material absorbing high-frequency electromagnetic radiation are demonstrated.

• OSTI ID: 22617184
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 3 Vol. 123; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLITUDES
BARIUM COMPOUNDS
COERCIVE FORCE
CONCENTRATION RATIO
CRYSTAL STRUCTURE
CRYSTALS
CURIE POINT
FERRITES
FERROMAGNETIC RESONANCE
GALLIUM ADDITIONS
LINE WIDTHS
MAGNETIC FIELDS
MAGNETIZATION
MICROWAVE RADIATION
POWDERS
SATURATION
SOLID SOLUTIONS
SOLIDS
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION