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Title: Surface driven effects on magnetic properties of antiferromagnetic LaFeO{sub 3} nanocrystalline ferrite

LaFeO{sub 3} nanocrystalline ferrites were synthesized through sol-gel method in different size distributions and the effect of finite size on magnetic properties is investigated. Results of magnetization and Mössbauer measurements show that superparamagnetism and weak ferromagnetic behavior in some of the size distributions. The origin of the superparamagnetism is from fine particles similar to ferromagnetic single domains and the weak ferromagnetism comes from surface spin disorder caused by Dzyaloshinskii-Moriya interaction. The magnetic ground state of LaFeO{sub 3} nanoparticles differs from that of bulk, and the ground state is dictated by the finite size effect because density of states depends on the dimensionality of the sample.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. School of Physics, University of Hyderabad, Hyderabad, Telangana 500 046 (India)
  2. Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Hyderabad, Telangana 500 058 (India)
  3. (India)
Publication Date:
OSTI Identifier:
22306006
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETIC MATERIALS; CRYSTALS; DENSITY; DISTRIBUTION; FERRITES; FERROMAGNETISM; GROUND STATES; INTERACTIONS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; MOESSBAUER EFFECT; NANOMATERIALS; NANOPARTICLES; SOL-GEL PROCESS; SPIN; SUPERPARAMAGNETISM; SURFACES