Dramatic enhancement of the saturation magnetization of a sol-gel synthesized Y3Fe5O12 by a mechanical pressing process

Min Sun Jang, Im Jun Roh, Jungmin Park, Chong-Yun Kang, Won Jun Choi, Seung Hyub Baek, Sung Soo Park, Jung Woo Yoo, Ki Suk Lee

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We fabricated polycrystalline yttrium-iron-garnet (Y3Fe5O12, YIG) samples using the sol-gel synthesis method to develop an energy harvesting material based on the spin Seebeck effect. We confirmed that crystallization occurred during calcination at 850 °C and that only the polycrystalline YIG structure was formed. We found that a sintering process at 1400 °C not only increased the size of the YIG particles and the densification of their microstructure but also enhanced their saturation magnetization (Ms) and dramatically reduced their coercivity (Hc). A mechanical pressing process was carried out between the calcination and sintering treatments to prepare a free-standing YIG fillet sample. We found that Ms was enhanced by almost three times without an associated reduction in Hc. We found that mechanical pressing assists the oxidation reaction during the subsequent sintering process by increasing the surface energy and densification before the heat treatment.

Original languageEnglish
Pages (from-to)693-697
Number of pages5
JournalJournal of Alloys and Compounds
Volume711
DOIs
Publication statusPublished - 2017 Jul 15

Keywords

  • Magnetic measurements
  • Microstructure
  • Oxidation
  • Sol-gel processes
  • Thermoelectric materials

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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