Yusuf, S. M. ; Manna, P. K. ; Shirolkar, Mandar M. ; Kulkarni, S. K. ; Tewari, R. (2013) A study of exchange bias in BiFeO3 core/NiFe2O4 shell nanoparticles Journal of Applied Physics, 113 (17). Article ID 173906. ISSN 0021-8979
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Official URL: http://aip.scitation.org/doi/abs/10.1063/1.4803549
Related URL: http://dx.doi.org/10.1063/1.4803549
Abstract
We have carried out magnetization measurements on BiFeO3 core/NiFe2O4 shell nanoparticles, and searched for the exchange bias phenomenon in this system. The core-shell nature of these nanoparticles has been established from the transmission electron microscopy images. The neutron diffraction study establishes that the core is G-type antiferromagnetic, while the shell is ferrimagnetic in nature. The search for an exchange bias phenomenon in the core-shell system shows a shift of the field-cooled (FC) hysteresis loops, at 5 K, along the magnetic field axis. The present investigation shows an unusual shift of the zero field-cooled (ZFC) hysteresis loop along the magnetic field axis as well. An enhancement of the remanent magnetization along with a decrease in the coercivity is also observed in the FC case, as compared to the corresponding values in the ZFC case, which is not found commonly in any conventional exchange-biased system. All these features indicate the presence of an interface exchange coupling between core and shell of the studied nanoparticles.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Institute of Physics. |
ID Code: | 112071 |
Deposited On: | 01 Dec 2017 11:48 |
Last Modified: | 01 Dec 2017 11:48 |
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