Improving exchange-spring nanocomposite permanent magnets

J. S. Jiang, J. E. Pearson, Z. Y. Liu, B. Kabius, S. Trasobares, D. J. Miller, S. D. Bader, D. R. Lee, D. Haskel, G. Srajer, J. P. Liu

Research output: Contribution to journalArticle

115 Scopus citations

Abstract

We demonstrate a counterintuitive approach for improving exchange-spring magnets. Contrary to the general belief that the exchange-spring interface must be ideal and atomically coherent, we thermally process, by annealing or high-temperature deposition, epitaxial Sm-Co/Fe thin-film bilayers to induce interfacial mixing. Synchrotron x-ray scattering and electron microscopy elemental mapping confirm the formation of a graded interface. The thermal processing enhances the nucleation field and the energy product. The hysteresis loop becomes more single-phase-like yet the magnetization remains fully reversible. Model simulations produce demagnetization behaviors similar to experimental observations.

Original languageEnglish (US)
Article number3
Pages (from-to)5293-5295
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number22
DOIs
StatePublished - Nov 29 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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