Nanomaterials for Information Storage

Shen, J. X.; Shan, Z. S.; Wang, D.; Liu, Yi; Sellmyer, David J.

doi:10.1002/chin.200337210

Cited by 1 publication

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“…Interest in magnetic nanoparticles has greatly increased in the past few years due to their importance in understanding the fundamentals in magnetism and their wide range of applications such as high-density information storage, ferrofluid technology, magnetically guided drug delivery, and magnetic resonance imaging (MRI) enhancement. [1][2][3][4][5][6] A better understanding of the fundamental properties of magnetic nanoparticles certainly is crucial to such applications, especially the superparamagnetic relaxation in nanoscale materials. The superparamagnetic state occurs when the anisotropy energy E A of nanoparticles is overcome thermally.…”

Section: Introductionmentioning

confidence: 99%

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe₂O₄ and MnFe₂O₄ Nanocrystals

2004

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The interparticle distance has been systematically varied by controlling the concentration of 8-nm CoFe 2 O 4 or MnFe 2 O 4 spinel ferrite nanocrystals dispersed in eicosane. For both nanoparticulate systems, the blocking temperature decreased with increasing interparticle distance through dilution of nanocrystals, which suggests a decrease in the anisotropy energy barrier E A . The blocking temperature for MnFe 2 O 4 nanoparticles decreased continuously with decreasing nanocrystal concentration in eicosane. However, the blocking temperature for CoFe 2 O 4 remained constant until ∼15% (wt %) concentration, below which the blocking temperature decreased sharply. The reduced remanence (M R /M S ) decreased with decreasing interparticle distance for MnFe 2 O 4 , while it increased for CoFe 2 O 4 . The differences in magnetic response upon varying interparticle distance between the two systems are attributed to the strength of the dipole interactions. The behavior of the CoFe 2 O 4 nanoparticulate system is consistent with the notion of nanoparticulate cluster formation.

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Section: Introductionmentioning

confidence: 99%

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe₂O₄ and MnFe₂O₄ Nanocrystals

2004

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Nanomaterials for Information Storage

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 1 publication

References 87 publications

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe₂O₄ and MnFe₂O₄ Nanocrystals

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe₂O₄ and MnFe₂O₄ Nanocrystals

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Nanomaterials for Information Storage

Abstract: For Abstract see ChemInform Abstract in Full Text.

Cited by 1 publication

References 87 publications

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe2O4 and MnFe2O4 Nanocrystals

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe2O4 and MnFe2O4 Nanocrystals

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Effects of Interparticle Interactions upon the Magnetic Properties of CoFe₂O₄ and MnFe₂O₄ Nanocrystals

Effects of Interparticle Interactions upon the Magnetic Properties of CoFe₂O₄ and MnFe₂O₄ Nanocrystals