Exchange bias effect in BiFeO{sub 3}-NiO nanocomposite

Journal Article · Tue Jan 07 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4861140· OSTI ID:22271283

Chakrabarti, Kaushik; Sarkar, Babusona; Dev Ashok, Vishal; Das, Kajari; Sinha Chaudhuri, Sheli ^[1]; Mitra, Amitava ^[2]

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1. Department of Electronics and Telecommunication Engineering, Jadavpur University, Jadavpur, Kolkata 700032 (India)
2. Material Science and Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 7 (India)

Ferromagnetic BiFeO{sub 3} nanocrystals of average size 11 nm were used to form nanocomposites (x)BiFeO{sub 3}/(100 − x)NiO, x = 0, 20, 40, 50, 60, 80, and 100 by simple solvothermal process. The ferromagnetic BiFeO{sub 3} 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 BiFeO{sub 3} owing to reduction in particle size compared to its spin spiral wavelength (62 nm) results in ferromagnetic ordering in pure BiFeO{sub 3} nanocrystals. High Neel temperature (T{sub N}) of NiO leads to significant exchange bias effect across the BiFeO{sub 3}/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 BiFeO{sub 3} nanocrystals and NiO nanostructures.

• OSTI ID: 22271283
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
COERCIVE FORCE
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
COUPLING
FERRITES
INTERFACES
NANOSTRUCTURES
NEEL TEMPERATURE
NICKEL OXIDES
PARTICLE SIZE
SPIN
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION