The magnetic characterization of nanoscale materials is usually made by measuring a hysteresis loop. It is not possible to obtain interaction or coercivity distribution information from the hysteresis loop alone, however. First-order-reversal-curves (FORCs) provide insight into the relative proportions of reversible and irreversible components of the magnetization of a material. This paper will discuss the FORC measurement technique and subsequent analysis which lead to the FORC diagram, and present examples of measurement results for different magnetic materials.

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