Exchange interaction at the interface of Fe-NiO nanocomposites

Journal Article · Wed Dec 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.09.037· OSTI ID:21494145

Pati, S P; Bhushan, B ^[1]; Das, D ^[1]

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1. UGC-DAE Consortium for Scientific Research, Kolkata Centre III/LB-8, Bidhannagar, Kolkata 700 098 (India)

Fe-NiO nanocomposites with Fe to NiO ratio 20:80, 30:70 and 50:50 were prepared by a chemical route. X-ray diffraction and TEM measurements showed the presence of {alpha}-Fe and NiO phases in the prepared nanocomposites having an average crystallite size 17 nm. HRTEM image showed a structurally disordered phase at the Fe-NiO interface. Moessbauer spectra of the nanocomposites consist of a doublet along with a sextet corresponding to relaxed and blocked {alpha}-Fe phases, respectively. The dc magnetization measurements in field-cooled condition show a shift of hysteresis loop and an enhancement of coercive field at low temperature confirming the presence of exchange bias at Fe-NiO interfaces. The irreversibility observed in the FC and ZFC magnetization measurements also points to exchange bias effect. -- Graphical abstract: Fe-NiO nanocomposites exhibited some structural disordered region at the interface as revealed by HRTEM. A prominent shift in the hysteresis loops in field cooled condition confirmed the presence of exchange bias at Fe-NiO interfaces. The irreversibility observed in M-T measurements also points to exchange bias effect. Display Omitted

• OSTI ID: 21494145
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 12; Other Information: DOI: 10.1016/j.jssc.2010.09.037; PII: S0022-4596(10)00436-6; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
COMPOSITE MATERIALS
EXCHANGE INTERACTIONS
HYSTERESIS
INTERFACES
IRON-ALPHA
MAGNETIC PROPERTIES
MAGNETIZATION
MOESSBAUER EFFECT
NANOSTRUCTURES
NICKEL OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
INTERACTIONS
IRON
MATERIALS
METALS
MICROSCOPY
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS