Improving exchange-spring nanocomposite permanent magnets

Jiang, J. S.; Pearson, J. E.; Liu, Z. Y.; Kabius, B.; Trasobares, S.; Miller, D. J.; Bader, S. D.; Lee, D. R.; Haskel, D.; Srajer, G.; Liu, J. P.
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5293
Academic Journal
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.


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