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Title: Exchange Coupling in Nano-Textured SmCo5/Fe and Ni/CoFe2O4 Permanent Magnets

Abstract

The widespread use of magnets in actuators, generators and sensors has driven materials optimization research for decades, aiming to match the desirable properties of high remnant magnetization, and a high coercive field, to maximizing the energy product. Currently, Dy-doped NdFeB offers the best values, but its low operating temperature and the supply challenges of Dy are driving a search for alternatives. One such notion is the development of exchange coupled magnets, which combine a high coercivity (hard) magnet with a less coercive (soft) material which has a higher magnetization and no RE content. The strength of this approach is that exchange coupling between the two phases maintains the anisotropy in the soft material at high coercive fields. The result is a composite material with high energy density that can, theoretically, exceed the performance of the pure hard phase for specific architectures. In this experiment we studied two candidate materials for an exchange coupled magnet: NiFeB coated SmCo 5, and Ni@CoFe 2O 4 core shell nanoparticles, using element-specific XMCD hysteresis loops to investigate the magnetisation reversal process in these composite systems.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1430911
Report Number(s):
LLNL-TR-747579
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Baker, A. A., Worthington, M. W., Baker, S. E., Lee, J. I., Orme, C. A., Kuntz, J., van Buuren, T., and McCall, S. K.. Exchange Coupling in Nano-Textured SmCo5/Fe and Ni/CoFe2O4 Permanent Magnets. United States: N. p., 2018. Web. doi:10.2172/1430911.
Baker, A. A., Worthington, M. W., Baker, S. E., Lee, J. I., Orme, C. A., Kuntz, J., van Buuren, T., & McCall, S. K.. Exchange Coupling in Nano-Textured SmCo5/Fe and Ni/CoFe2O4 Permanent Magnets. United States. doi:10.2172/1430911.
Baker, A. A., Worthington, M. W., Baker, S. E., Lee, J. I., Orme, C. A., Kuntz, J., van Buuren, T., and McCall, S. K.. Fri . "Exchange Coupling in Nano-Textured SmCo5/Fe and Ni/CoFe2O4 Permanent Magnets". United States. doi:10.2172/1430911. https://www.osti.gov/servlets/purl/1430911.
@article{osti_1430911,
title = {Exchange Coupling in Nano-Textured SmCo5/Fe and Ni/CoFe2O4 Permanent Magnets},
author = {Baker, A. A. and Worthington, M. W. and Baker, S. E. and Lee, J. I. and Orme, C. A. and Kuntz, J. and van Buuren, T. and McCall, S. K.},
abstractNote = {The widespread use of magnets in actuators, generators and sensors has driven materials optimization research for decades, aiming to match the desirable properties of high remnant magnetization, and a high coercive field, to maximizing the energy product. Currently, Dy-doped NdFeB offers the best values, but its low operating temperature and the supply challenges of Dy are driving a search for alternatives. One such notion is the development of exchange coupled magnets, which combine a high coercivity (hard) magnet with a less coercive (soft) material which has a higher magnetization and no RE content. The strength of this approach is that exchange coupling between the two phases maintains the anisotropy in the soft material at high coercive fields. The result is a composite material with high energy density that can, theoretically, exceed the performance of the pure hard phase for specific architectures. In this experiment we studied two candidate materials for an exchange coupled magnet: NiFeB coated SmCo5, and Ni@CoFe2O4 core shell nanoparticles, using element-specific XMCD hysteresis loops to investigate the magnetisation reversal process in these composite systems.},
doi = {10.2172/1430911},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 09 00:00:00 EST 2018},
month = {Fri Mar 09 00:00:00 EST 2018}
}

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