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

130 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",

month = nov,

day = "29",

doi = "10.1063/1.1828225",

language = "English (US)",

volume = "85",

pages = "5293--5295",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

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TY - JOUR

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.

UR - https://www.scopus.com/pages/publications/19944395844

UR - https://www.scopus.com/pages/publications/19944395844#tab=citedBy

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DO - 10.1063/1.1828225

M3 - Article

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EP - 5295

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

M1 - 3

ER -

Improving exchange-spring nanocomposite permanent magnets

Abstract

All Science Journal Classification (ASJC) codes

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