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

doi:10.1063/1.1828225

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

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

125 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 language	English (US)
Article number	3
Pages (from-to)	5293-5295
Number of pages	3
Journal	Applied Physics Letters
Volume	85
Issue number	22
DOIs	https://doi.org/10.1063/1.1828225
State	Published - Nov 29 2004

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1828225

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title = "Improving exchange-spring nanocomposite permanent magnets",

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.",

author = "Jiang, {J. S.} and Pearson, {J. E.} and Liu, {Z. Y.} and B. Kabius and S. Trasobares and Miller, {D. J.} and Bader, {S. D.} and Lee, {D. R.} and D. Haskel and G. Srajer and Liu, {J. P.}",

note = "Funding Information: Work at Argonne was supported by the U.S. DOE BES-MS Contract No. W-31-109-ENG-38. The authors thank Y. Choi for assistance with the reflectivity measurements. EFTEM was carried out at Argonne's Electron Microscopy Center. J.P.L. was supported by the U.S. DOD/DARPA Grant No. DAAD 19-01-1-0546.",

year = "2004",

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doi = "10.1063/1.1828225",

language = "English (US)",

volume = "85",

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journal = "Applied Physics Letters",

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T1 - Improving exchange-spring nanocomposite permanent magnets

AU - Jiang, J. S.

AU - Pearson, J. E.

AU - Liu, Z. Y.

AU - Kabius, B.

AU - Trasobares, S.

AU - Miller, D. J.

AU - Bader, S. D.

AU - Lee, D. R.

AU - Haskel, D.

AU - Srajer, G.

AU - Liu, J. P.

N1 - Funding Information: Work at Argonne was supported by the U.S. DOE BES-MS Contract No. W-31-109-ENG-38. The authors thank Y. Choi for assistance with the reflectivity measurements. EFTEM was carried out at Argonne's Electron Microscopy Center. J.P.L. was supported by the U.S. DOD/DARPA Grant No. DAAD 19-01-1-0546.

PY - 2004/11/29

Y1 - 2004/11/29

N2 - 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.

AB - 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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JF - Applied Physics Letters

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Improving exchange-spring nanocomposite permanent magnets

Abstract

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