High-Temperature First-Order-Reversal-Curve (FORC) Study of Magnetic Nanoparticle Materials

B. Dodrill, P. Ohodnicki
Lake Shore Cryotronics,
United States

Keywords: First-order-reversal-curves, FORC, magnetic nanoparticles

Summary:

First-order-reversal-curves (FORC) are an elegant tool for characterizing the magnetic properties of materials. The technique has been extensively used to investigate the magnetic properties of natural samples because it can distinguish between different domain states and mineral species. More recently, FORC has been applied to a wider array of magnetic materials because it yields information regarding magnetic interactions and coercivity distributions which cannot be obtained from measurements of a materials hysteresis loop alone. We will discuss the FORC measurement and analysis technique and present high temperature FORC results for two different magnetic nanoparticle materials: CoFe nanoparticles dispersed in a SiO2 matrix, and FeCo-based nanocrystalline amorphous/nanocomposites.