I have synthesis the composites of hard and soft phase with varying concentration of hard phase.From their VSM data i have plotted dM/dH vs H curve which are showing peaks.Each compositions have different intensity peak and some shifting.I want to know what this plot called and what is the significance of this plot in defining the exchange coupling between hard and soft phases?
where M=Magnetic moments
H=External magnetic field applied
It is similar to dB/dH, M the magnetomotive force, is proposal to flux density, and the field intensity (H) is praposnal to, amperturn (AT), or could follow the BH curve of material or the media..........
Dear Vipul Sharma,
the quantity dM/dH you are measuring is the total susceptibility of the material and it is composed of the reversible susceptibility and the irreversible one. The reversible part can come from e.g. reversible domain wall movements or from reversible rotation processes and is often a rather smooth and broad function of H. The irreversible part is often called the switching field distribution, as it tells at which fields the magnetization reverses/switches, and is therefore peaked around the coercivity of your hard magnetic fraction. Thus, it makes sense that these peaks change with composition. If you want to study this in detail, you should however determine the irreversible susceptibility by performing a remanence analysis in the demagnetizing branch, and if you furthermore want to characterize coupling effects, you should compare this remanence analysis in the demagnetizing branch with that of the magnetizing branch starting from a thermally demagnetized sample – a so-called deltaM-analysis.An example of such an analysis you find in the attached publication and references therein.
Article Relevance of pinning, nucleation, and interaction in nanogra...
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