In this paper, we investigate the magnetization reversal in single-phase and two-phase with varying nanoscale grain structures and intergranular exchange interactions produced via controlled segregation during crystallization. We show that the loss of coercivity arises because domain-wall processes dominate the magnetic reversal as the exchange interactions increase. Micromagnetic modeling corroborates a transition to strongly cooperative magnetic reversal as the exchange interactions increase. The magnetic reversal is controlled by the growth of interaction domains via discrete domain-wall motion, and the coercivity is intrinsically limited by the presence of interaction domains. To alleviate this problem, we have built an additional length scale into the structure that is below the interaction domain size but above the limit for intergranular exchange interactions to be significant. These “single-interaction domain” structures retain nucleation-type magnetic reversal and high coercivity. We show experimentally that nanocomposite Sm-Co/Co with this additional length scale has excellent coercivity and nucleation-controlled reversal.
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15 April 2006
50th Annual Conference on Magnetism and Magnetic Materials
30 October-3 November 2005
San Jose, California (USA)
Research Article|
Magnetism and Magnetic Materials|
April 19 2006
Magnetic reversal in three-dimensional exchange-spring permanent magnets
J. E. Shield;
J. E. Shield
a)
Department of Mechanical Engineering and Center for Materials Research and Analysis,
University of Nebraska-Lincoln
, Lincoln, Nebraska 68588
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J. Zhou;
J. Zhou
Center for Materials Research and Analysis,
University of Nebraska-Lincoln
, Lincoln, Nebraska 68588
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S. Aich;
S. Aich
Department of Mechanical Engineering,
University of Nebraska-Lincoln
, Lincoln, Nebraska 68588
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V. K. Ravindran;
V. K. Ravindran
Department of Mechanical Engineering,
University of Nebraska-Lincoln
, Lincoln, Nebraska 68588
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R. Skomski;
R. Skomski
Department of Physics and Astronomy and Center for Materials Research and Analysis,
University of Nebraska-Lincoln
, Lincoln, Nebraska 68588
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D. J. Sellmyer
D. J. Sellmyer
Department of Physics and Astronomy and Center for Materials Research and Analysis,
University of Nebraska-Lincoln
, Lincoln, Nebraska 68588
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a)
Electronic mail: [email protected]
J. Appl. Phys. 99, 08B508 (2006)
Citation
J. E. Shield, J. Zhou, S. Aich, V. K. Ravindran, R. Skomski, D. J. Sellmyer; Magnetic reversal in three-dimensional exchange-spring permanent magnets. J. Appl. Phys. 15 April 2006; 99 (8): 08B508. https://doi.org/10.1063/1.2163837
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