UPM Institutional Repository

Dependence of magnetic and microwave loss on evolving microstructure in yttrium iron garnet


Nazlan, Rodziah and Ismail, Ismayadi and Azis, Raba’ah Syahidah and Abbas, Zulkifly and Ibrahim, Idza Riati and Mohd Idris, Fadzidah and Shafiee, Farah Nabilah and Abdul Rahim @ Arifin, Azdiya Suhada and Busra, Nurul Ainaa Najihah (2018) Dependence of magnetic and microwave loss on evolving microstructure in yttrium iron garnet. Journal of Materials Science: Materials in Electronics, 29 (10). 8688 - 8700. ISSN 0957-4522; ESSN: 1573-482X


The parallel magnetic and microwave loss dependence on microstructural evolutions in several polycrystalline yttrium iron garnet samples were studied in detail, focusing on the attendant occurrence of their relationships. In this study, polycrystalline YIG samples were synthesized by employing the mechanical alloying technique and sintering toroidal compacts at temperatures from 600 to 1400 °C. The samples were characterized for their evolution in crystalline phases, structure, microstructure, magnetic hysteresis parameters, microwave losses and electrical resistivity. The results showed an increasing tendency of the saturation magnetization with grain size, which is attributed to crystallinity increase in the grains. The M–H hysteresis loop results showed a transition from disordered-to-ordered magnetism which belongs to different magnetically dominant stages of formation. The starting appearance of room temperature ferromagnetic order suggested by the sigmoid-shaped loops seems to be dependent on crystallinity, phase purity and a sufficient number of large enough magnetic domain-containing grains having been formed in the microstructure. An increasing trend of transmission loss with grain size may be attributed to increment of loss contribution from hysteresis and domain wall resonance of the samples. The changes in crystallinity and microstructure, and the associated processes of microwave resonance and relaxation due to domain wall movements and damping of spin rotation contributes to the variations in transmission loss and ferromagnetic linewidth of the samples. The increased electrical resistivity while the microstructure was evolving is believed to strongly indicates improved phase purity and compositional stoichiometry.

Download File

[img] Text
Dependence of magnetic and microwave loss on evolving microstructure in yttrium iron garnet.pdf

Download (45kB)

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.1007/s10854-018-8884-8
Publisher: Springer
Keywords: Magnetic loss; Microwave loss; Yttrium iron garnet
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 06 Mar 2020 00:38
Last Modified: 06 Mar 2020 00:38
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1007/s10854-018-8884-8
URI: http://psasir.upm.edu.my/id/eprint/72183
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item