Exchange bias effect in BiFeO3-NiO nanocomposite

Ferromagnetic BiFeO3 nanocrystals of average size 11 nm were used to form nanocomposites (x)BiFeO3/(100 − x)NiO, x = 0, 20, 40, 50, 60, 80, and 100 by simple solvothermal process. The ferromagnetic BiFeO3 nanocrystals embedded in antiferromagnetic NiO nanostructures were confirmed from X-ray diffrac...

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Bibliographic Details
Published in:Journal of applied physics 2014-01, Vol.115 (1)
Main Authors: Chakrabarti, Kaushik, Sarkar, Babusona, Dev Ashok, Vishal, Das, Kajari, Sinha Chaudhuri, Sheli, Mitra, Amitava, De, S. K.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Applied physics
Bias
Bismuth ferrite
Coercivity
Coupling
Exchanging
Ferromagnetism
Nanocomposites
Nanocrystals
Nanostructure
Neel temperature
Nickel oxides
Particle spin
Spin structure
X-ray diffraction
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Summary:Ferromagnetic BiFeO3 nanocrystals of average size 11 nm were used to form nanocomposites (x)BiFeO3/(100 − x)NiO, x = 0, 20, 40, 50, 60, 80, and 100 by simple solvothermal process. The ferromagnetic BiFeO3 nanocrystals embedded in antiferromagnetic NiO nanostructures were confirmed from X-ray diffraction and transmission electron microscope studies. The modification of cycloidal spin structure of bulk BiFeO3 owing to reduction in particle size compared to its spin spiral wavelength (62 nm) results in ferromagnetic ordering in pure BiFeO3 nanocrystals. High Neel temperature (TN) of NiO leads to significant exchange bias effect across the BiFeO3/NiO interface at room temperature. A maximum exchange bias field of 123.5 Oe at 300 K for x = 50 after field cooling at 7 kOe has been observed. The exchange bias coupling causes an enhancement of coercivity up to 235 Oe at 300 K. The observed exchange bias effect originates from the exchange coupling between the surface uncompensated spins of BiFeO3 nanocrystals and NiO nanostructures.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4861140