MURPHYS-HSFS-2014 - 7th International Workshop on Multi-Rate Processes & Hysteresis, 2nd International Workshop on Hysteresis and Slow-Fast Systems, April 7-11, 2014 - Abstract

Stancu, Alexandru

FORC experimental technique from qualitative to quantitative interpretation. What are the limits?

The analysis of many hysteretic processes using the first-order reversal (FORC) technique is becoming more and more popular in the scientific world. Starting with the well-known ferromagnetic hysteresis, the FORC diagram technique is now used for the study of ferroelectric hysteresis and even for exotic forms of hysteretic processes like the ones observed in spin transition materials (thermal, light induced and/or pressure hysteresis) [1-4]. As the FORC technique was first designed as an identification technique for the Classical Preisach Model (Mayergoyz, 1985) it is understandable that the main line of interpretation for the experimental FORC diagrams is related to the Preisach distribution. In most cases the FORC distributions are seen as slightly distorted Preisach distributions. Moreover, many researchers think that to each region of the experimental FORC one can associate a group of physical elements from the system with the measured properties (coercivity and interactions). As the effort to produce even more detailed FORC diagrams from experimental data (named high quality FORC diagrams) it become really significant to review with critical eye the quantitative interpretation of these diagrams. The aim of this approach is to find the real connections between the hysteresis of the microscopic physical entities and the diagram. As fundamental physical element we have chosen magnetic nanowires integrated in perfect geometrical networks. 1D and 2D systems were analyzed and we have obtained surprising results [5]. We present how strong inter-wire interactions can distort the experimental diagram and can give specific features on the experimental FORC.

Acknowledgement: This work was supported by a grant of the Romanian National Authority for Scientific Research, CNCS-UEFISCDI, Project No. PN-II-ID-PCE-2011-3-0794 [IDEI-EXOTIC No.185/ 25.10.2011].

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