[HTML][HTML] Size Determines Efficacy of Nanoparticle Magnetoresistance<? ACS-CT-END-Insert?>
TJ Pearson, DE Freedman - 2018 - ACS Publications
2018•ACS Publications
… size of the CoFe 2 O 4 nanoparticles to 12.7 nm, differential magnetoresistance of the
sample dramatically decreased from 18.4% at d = 8.4 nm to 6.6% at d = 12.7 nm. This
counterintuitive decrease occurred despite the higher saturation magnetization values and
magnetic blocking temperatures of the larger particles. These results show, for the first time,
the powerful nonlinearity of the relationship between the size and magnetoresistive
properties of superparamagnetic nanoparticles and demonstrate the presence of a critical …
sample dramatically decreased from 18.4% at d = 8.4 nm to 6.6% at d = 12.7 nm. This
counterintuitive decrease occurred despite the higher saturation magnetization values and
magnetic blocking temperatures of the larger particles. These results show, for the first time,
the powerful nonlinearity of the relationship between the size and magnetoresistive
properties of superparamagnetic nanoparticles and demonstrate the presence of a critical …
The ability of magnetic nanoparticles to act as magnetoresistors depends on their size, not blocking temperature, suggesting a new approach to creating magnetoresistors.
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