JOURNAL CLUB DO DEPARTAMENTO DE FÍSICA DOS MATERIAIS E MECÂNICA
Nesta semana o pós-graduando, Vinicius Pena Cotto Limeira, do Laboratório de Materiais Magnéticos, apresentará o artigo: “First Order Reversal Curves and Intrinsic Parameter Determination for Magnetic Materials; Limitations of Hysteron-based Approaches in Correlated Systems” https://www.nature.com/articles/srep45218
Dia: 10 de maio, quarta-feira, às 12h10.
Local: Sala de Seminários José Roberto Leite Ed. Alessandro Volta (bloco C) – Sala 110, IFUSP.
Abstract:
The generic problem of extracting information on intrinsic particle properties from the whole class of interacting magnetic fine particle systems is a long standing and difficult inverse problem. As an example, the Switching Field Distribution (SFD) is an important quantity in the characterization of magnetic systems, and its determination in many technological applications, such as recording media, is especially challenging. Techniques such as the first order reversal curve (FORC) methods, were developed to extract the SFD from macroscopic measurements. However, all methods rely on separating the contributions to the measurements of the intrinsic SFD and the extrinsic effects of magnetostatic and exchange interactions. We investigate the underlying physics of the FORC method by applying it to the output predictions of a kinetic Monte-Carlo model with known input parameters. We show that the FORC method is valid only in cases of weak spatial correlation of the magnetisation and suggest a more general approach.
