A new approach for improving exchange-spring 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 journalArticlepeer-review

79 Scopus citations


It is demonstrated here that an already ideal exchange-spring magnet can be further improved by intermixing the interface. This is counter-intuitive to the general expectation that optimal exchange-spring magnet behavior requires an ideal, atomically coherent soft-hard interface. Epitaxial Sm-Co/Fe thin-film exchange-spring bilayers are thermally processed, by annealing or high-temperature deposition, to induce interdiffusion. With increasing processing temperature, the hysteresis loop becomes more single-phase-like, yet the magnetization remains fully reversible. The interface is characterized via synchrotron x-ray scattering and electron microscopy elemental mapping. The magnetization behavior is modeled by assuming a graded interface where the material parameters vary continuously. The simulations produce demagnetization curves similar to experimental observations.

Original languageEnglish (US)
Article number10K311
JournalJournal of Applied Physics
Issue number10
StatePublished - May 15 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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