Large Tunability of Néel Temperature by Growth-Rate-Induced Cation Inversion in Mn-ferrite Nanoparticles
The tuning of Neel temperature by greater than 100 K in nanoparticle Mn-ferrite was demonstrated by a growth-rate-induced cation inversion. Mn-ferrite nanoparticles, having diameters from 4 to 50 nm, were synthesized via coprecipitation synthesis. The Neel temperature (TN) increased inversely to the cation inversion parameter, {delta} (i.e., defined as (Mn1-{delta}Fe{delta})tet[Mn{delta}Fe2-{delta}]octO4). Concomitantly, TN increased with increased particle growth rate and particle size. These results unambiguously establish cation inversion as the dominant mechanism in modifying the superexchange leading to enhanced TN. The ability to tailor TN enables greater flexibility in applying nanoparticle ferrites in emerging technologies.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 980300
- Report Number(s):
- BNL-93218-2010-JA; APPLAB; TRN: US201015%%1685
- Journal Information:
- Applied Physics Letters, Vol. 94; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Size Dependent Magnetic Properties and Cation Inversion in Chemically Synthesized MnFe2O4 Nanoparticles
Investigations of cations distributions and morphology of cobalt ferrite magnetic nanoparticles