Abstract
The tuning of Néel 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,δ (i.e., defined as (Mn1-δFeδ)tet[MnδFe2-δ]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.
Keywords
TN, tuning of Néel temperature, magnetic ordering temperature, tunability, growth-rate-induced cation inversion, Mn-ferrite, coprecipitation synthesis
Subject Categories
Nanoparticles, Ferrites (Magnetic materials)
Disciplines
Electromagnetics and photonics
Publisher
American Institute of Physics
Publication Date
3-16-2009
Rights Information
Copyright 2009 American Institute of Physics.
Rights Holder
American Institute of Physics
Permanent URL
Recommended Citation
Yang, Aria; Chinnasamy, C. N.; Greneche, J. M.; Chen, Yajie; Yoon, Soack D.; Hsu, Kailin; Vittoria, C.; and Harris, V. G., "Large tunability of Néel temperature by growth-rate-induced cation inversion in Mn-ferrite nanoparticles" (2009). Electrical and Computer Engineering Faculty Publications. Paper 65. http://hdl.handle.net/2047/d20002236
Figure 1
large_tunability_of_neel_fig2.zip (121 kB)
Figure 2
large_tunability_of_neel_fig3.zip (100 kB)
Figure 3
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Additional Files
large_tunability_of_neel_fig1.zip (101 kB)Figure 1
large_tunability_of_neel_fig2.zip (121 kB)
Figure 2
large_tunability_of_neel_fig3.zip (100 kB)
Figure 3
Notes
Originally published in Applied Physics Letters 94, 113109 (2009). DOI:10.1063/1.3099340 (http://dx.doi.org/10.1063/1.3099340).