Abstract
Kinetics of magnetization relaxation of the exotic ε-In0.24Fe1.76O3 nanoparticles under applied magnetic field has been studied. The fluctuation field and the activation volume have been calculated from the magnetic viscosity data. The relation between magnetic viscosity and magnetic noise caused by the random thermally activated magnetization reversal of a single nanoparticle has been established. Stepped sweeping of magnetic field expands the windows of experimentally detectable magnetic fluctuations. The changes in the reversal magnetic field provide ε-In0.24Fe1.76O3 nanoparticles scanning and sorting them by magnetic noise frequency.
Highlights
It has become possible to create new nanomagnets based on the epsilon phase of iron (III) oxide ε-Fe2O3 with a giant coercive force [1]
The purpose of this work is to find a relation between magnetic viscosity and spectral characteristics of magnetic fluctuations in epsilon phase of iron oxide nanoparticle ensembles
Tangent of the slope of ΔM(lnt) curve corresponds to magnetic viscosity S: S = kBT/ΔE
Summary
It has become possible to create new nanomagnets based on the epsilon phase of iron (III) oxide ε-Fe2O3 with a giant (up to 2.34 T) coercive force [1]. This exceeds all known values revealed by such magnets as Fe14Nd2B or SmCo5. Permanent magnets based on ε-Fe2O3 nanoparticles are much cheaper than rare-earth magnets such as Nd14Fe2B and SmCo5. Static magnetic properties of ε-Fe2O3 nanoparticle ensembles were studied in detail [2]. In this work, slow relaxation of magnetization of the epsilon phase of iron oxide nanoparticle ensembles has been analyzed
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