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Magnetic Anisotropy and Switching Behavior of Fe3O4/CoFe2O4 Core/Shell Nanoparticles

  • 5th International Conference of Asian Union of Magnetics Societies
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Abstract

A uniform core/shell nanoparticle system composed of a soft magnetic core (Fe3O4) and a hard magnetic shell (CoFe2O4) was synthesized and characterized to understand how the shell influences the magnetism and exchange coupling of the system. In the case of Fe3O4(8 nm)/CoFe2O4(2 nm) core/shell nanoparticles, DC and AC susceptibility measurements revealed three features associated with the blocking temperatures of the core/shell system (TB-cs ∼  300 K), the CoFe2O4 shell (TB-s ∼ 200 K), and the Fe3O4 core (TB-c ∼ 50 K). Radio-frequency transverse susceptibility gave a direct probe of the effective magnetic anisotropy field (HK) and switching field (HS), as well as their temperature evolutions. Interestingly, we found that HK of the core/shell structure increased with decreasing temperature. HS was observed only below TB-s, which first decreased drastically with lowering temperature and then increased sharply below TB-c. This is attributed to the effect of a coercive field of CoFe2O4 on the spin flipping of Fe3O4 in the superparamagnetic state (TB-c < T < TB-s) and the blocked state (T < TB-c), respectively. Our study sheds light on the magnetic exchange coupling mechanism in core/shell nanoparticle systems and demonstrates the possibility of controlling the nanomagnetism of a soft magnetic core to which the hard magnetic shell is coupled in such systems.

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Acknowledgments

Research at the University of South Florida was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-FG02-07ER46438. Joshua Robles acknowledges the financial support provided by the NSF Florida-Georgia Louis Stokes Alliance for Minority Participation (FGLSAMP) through Award No. HRD #1612347.

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Authors and Affiliations

  1. Department of Physics, University of South Florida, Tampa, FL, 33620, USA

    R. Das, J. Robles, M. Glassell, V. Kalappattil, M. H. Phan & H. Srikanth

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  1. R. Das
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  2. J. Robles
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  3. M. Glassell
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  4. V. Kalappattil
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  5. M. H. Phan
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  6. H. Srikanth
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Das, R., Robles, J., Glassell, M. et al. Magnetic Anisotropy and Switching Behavior of Fe3O4/CoFe2O4 Core/Shell Nanoparticles. J. Electron. Mater. 48, 1461–1466 (2019). https://doi.org/10.1007/s11664-018-6778-4

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  • DOI: https://doi.org/10.1007/s11664-018-6778-4

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