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논문 기본 정보

자료유형
학술저널
저자정보
(National Research and Innovation Agency) (National Research and Innovation Agency) (National Research and Innovation Agency) (National Research and Innovation Agency) (National Research and Innovation Agency) (National Research and Innovation Agency) (Universitas Indonesia)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.28 No.3
발행연도
수록면
251 - 257 (7page)
DOI
10.4283/JMAG.2023.28.3.251

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초록· 키워드

This study aims to examine the effect of various composition ratios on the exchange spring effect of strontium ferrite (SrFe<SUB>12</SUB>O<SUB>19</SUB>)/cobalt ferrite (CoFe2O4) nanocomposite magnets. Nanoparticles of hexagonal hard phase SrFe<SUB>12</SUB>O<SUB>19</SUB> and spinel soft phase CoFe<SUB>2</SUB>O<SUB>4</SUB> were each prepared through mechanical alloying and high-power ultrasonic irradiation processes. Furthermore, the constituent of the hard-soft particles was weighed based on its ratios and the mixture was homogenized under a sonicator-type Qsonica at a frequency of 20 kHz for an hour. The bulk composite samples were obtained in cylindrical pellets form through compaction of mixture powders at 5000 kg/cm2, followed by sintering at 1200 °C. The exchange spring effect enhanced the magnetic properties, surpassing the normal limit for non-interacting magnetic particles due to enhanced grain interactions. The results showed that the degree of property enhancement depended on the various composition ratios and microstructure of the composite magnets. The magnetization of saturation (M<SUB>s</SUB>) of the samples increased compared to a single SrFe<SUB>12</SUB>O<SUB>19</SUB>. Furthermore, the highest coercivity (H<SUB>c</SUB>) and product energy maximum (BH)<SUB>max</SUB> values were observed in the sample which had mass ratios of SHF:COF of 85:15 with coded S80C20. The occurrence of exchange spring effects was observed in material characterized by a microstructure consisting of a hard-magnetic phase with elevated magnetocrystalline anisotropy and saturation magnetization values, along with a soft magnetic phase exhibiting high saturation magnetization value.
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목차

  1. 1. Introduction
  2. 2. Materials and Methods
  3. 3. Results and Discussions
  4. 4. Conclusion
  5. References

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