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

doi:10.1063/1.1855032

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

Materials Research Institute (MRI)

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

80 Scopus citations

Abstract

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 language	English (US)
Article number	10K311
Journal	Journal of Applied Physics
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.1855032
State	Published - May 15 2005

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1063/1.1855032

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@article{b04eaff335cc4aa6ae220098fe07372d,

title = "A new approach for improving exchange-spring magnets",

abstract = "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.",

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: The work at Argonne was supported by the U.S. DOE BES-MS under Contract No. W-31-109-ENG-38. We thank Y. Choi for assistance with the reflectivity measurements. EFTEM was carried out at the Electron Microscopy Center at Argonne National Laboratory. J. P. L. acknowledges support by the U.S. DOD∕DARPA under Grant No. DAAD 19-01-1-0546.",

year = "2005",

month = may,

day = "15",

doi = "10.1063/1.1855032",

language = "English (US)",

volume = "97",

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T1 - A new approach for improving exchange-spring 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: The work at Argonne was supported by the U.S. DOE BES-MS under Contract No. W-31-109-ENG-38. We thank Y. Choi for assistance with the reflectivity measurements. EFTEM was carried out at the Electron Microscopy Center at Argonne National Laboratory. J. P. L. acknowledges support by the U.S. DOD∕DARPA under Grant No. DAAD 19-01-1-0546.

PY - 2005/5/15

Y1 - 2005/5/15

N2 - 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.

AB - 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.

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A new approach for improving exchange-spring magnets

Abstract

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