Impact of Nd3+ Substitutions on the Structure and Magnetic Properties of Nanostructured SrFe12O19 Hexaferrite

Ashraf M Semaida; Moustafa A Darwish; Mohamed M Salem; Di Zhou; Tatiana I Zubar; Sergei V Trukhanov; Alex V Trukhanov; Vladimir P Menushenkov; Alexander G Savchenko

doi:10.3390/nano12193452

Impact of Nd³⁺ Substitutions on the Structure and Magnetic Properties of Nanostructured SrFe₁₂O₁₉ Hexaferrite

Nanomaterials (Basel). 2022 Oct 2;12(19):3452. doi: 10.3390/nano12193452.

Authors

Ashraf M Semaida^{1

2}, Moustafa A Darwish³, Mohamed M Salem³, Di Zhou⁴, Tatiana I Zubar^{5

6}, Sergei V Trukhanov^{6

7}, Alex V Trukhanov^{6

7

8}, Vladimir P Menushenkov¹, Alexander G Savchenko¹

Affiliations

¹ Physical Materials Science Department, National University of Science and Technology MISiS, 119049 Moscow, Russia.
² Physics Department, Faculty of Science, Damanhour University, Damanhour 22516, Egypt.
³ Physics Department, Faculty of Science, Tanta University, Al-Geish St., Tanta 31527, Egypt.
⁴ Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
⁵ Laboratory of Single Crystal Growth, South Ural State University, 76, Lenin Av., 454080 Chelyabinsk, Russia.
⁶ Laboratory of Magnetic Films Physics, SSPA "Scientific and Practical Materials Research Centre of NAS of Belarus", 19, P. Brovki Str., 220072 Minsk, Belarus.
⁷ Smart Sensor Systems Laboratory, Department of Electronic Materials Technology, National University of Science and Technology MISiS, 119049 Moscow, Russia.
⁸ L.N. Gumilyov Eurasian National University, Nur-Sultan 010000, Kazakhstan.

Abstract

In this study, SrFe_12-xNd_xO₁₉, where x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5, was prepared using high-energy ball milling. The prepared samples were characterized by X-ray diffraction (XRD). Using the XRD results, a comparative analysis of crystallite sizes of the prepared powders was carried out by different methods (models) such as the Scherrer, Williamson-Hall (W-H), Halder-Wagner (H-W), and size-strain plot (SSP) method. All the studied methods prove that the average nanocrystallite size of the prepared samples increases by increasing the Nd concentration. The H-W and SSP methods are more accurate than the Scherer or W-H methods, suggesting that these methods are more suitable for analyzing the XRD spectra obtained in this study. The specific saturation magnetization (σ_s), the effective anisotropy constant (K_eff), the field of magnetocrystalline anisotropy (H_a), and the field of shape anisotropy (H_d) for SrFe_12-xNd_xO₁₉ (0 ≤ x ≤ 0.5) powders were calculated. The coercivity (H_c) increases (about 9% at x = 0.4) with an increasing degree of substitution of Fe³⁺ by Nd^3+, which is one of the main parameters for manufacturing permanent magnets.

Keywords: Halder–Wagner method; Nd3+ doping; Williamson–Hall method; ball milling; nanohexaferrite.

Grants and funding

The work was carried out with financial support from the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of MISiS. The researcher Ashraf M. Semaida is funded by a full scholarship from the Ministry of Higher Education of the Arab Republic of Egypt.