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Type: Artigo de periódico
Title: First-order reversal curves acquired by a high precision ac induction magnetometer
Author: Beron, F
Soares, G
Pirota, KR
Abstract: We present a setup allowing to characterize the local irreversible behavior of soft magnetic samples. It is achieved by modifying a conventional ac induction magnetometer in order to measure first-order reversal curves (FORCs), a magnetostatic characterization technique. The required modifications were performed on a home-made setup allowing high precision measurement, with sensibility less than 0.005 Oe for the applied field and 10(-6) emu for the magnetization. The main crucial point for the FORCs accuracy is the constancy of the applied field sweep rate, because of the magnetic viscosity. Therefore, instead of the common way to work at constant frequency, each FORC is acquired at a slightly different frequency, in order to keep the field variation constant in time. The obtained results exhibit the consequences of magnetic viscosity, thus opening up the path of studying this phenomenon for soft magnetic materials. (C) 2011 American Institute of Physics. [doi:10.1063/1.3600796]
Country: EUA
Editor: Amer Inst Physics
Citation: Review Of Scientific Instruments. Amer Inst Physics, v. 82, n. 6, 2011.
Rights: aberto
Identifier DOI: 10.1063/1.3600796
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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