Relationship between blocking temperature and strength of interparticle interaction in magnetic nanoparticle systems
| Autor: | Mohindar S. Seehra, Kelly L. Pisane |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
010302 applied physics
Materials science Condensed Matter - Mesoscale and Nanoscale Physics Relaxation (NMR) Nanoparticle Thermodynamics FOS: Physical sciences 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Magnetic nanoparticles General Materials Science 0210 nano-technology |
| DOI: | 10.48550/arxiv.1510.08366 |
| Popis: | In magnetic nanoparticle systems, the variation of the blocking temperature T B with the measuring frequency f m is often used to determine the strength of the interparticle interactions (IPI) through a parameter Φ or the Vogel-Fulcher temperature T o . Presence of IPI is inferred if T o > 0 and Φ = ∆ T B [ T B ∆ log 10 f m ] 0.13 where Δ signifies changes in T B and f m . Here it is shown that these two parameters are related by the Eq. Φ = Φ o [ 1 − ( T o T B ( 1 ) ) ] where Φ o ≈ 0.11–0.15 is a constant of the system depending on the magnitudes of measuring frequency and the attempt frequency f o of the Neel relaxation. Using data on a variety of nanoparticle systems, experimental verification of this relationship is also presented. |
| Databáze: | OpenAIRE |
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