Effect of Demagnetization Technique on Remanence Measurements in Metallic Ferromagnets

Measurements of the remagnetization and demagnetization remanences of metallic ferromagnets were made using four different paths to zero magnetization (AC, DC, and thermal demagnetization) [1]. Parametric plots of these quantities, commonly known as Henkel plots, were compared to Wohlfarth’s model for noninteracting particulate ferromagnets [2]. Like the expected results for individual particles, our results show that the path to net zero magnetization strongly affects subsequent measurements. Although similar to Wohlfarth’s model in this regard, the overall adherence to his model was poor. However, many qualitative similarities between our data and models including magnetic interactions were found [3].

[1] J. Freedberg and E. D. Dahlberg, "Effect of Demagnetization Technique on Remanence Measurements in Metallic Ferromagnets," IEEE Trans. Magn., 56 (2020).
[2] E. P. Wohlfarth, "Relations between Different Modes of Acquisition of the Remanent Magnetization of Ferromagnetic Particles," J. Appl. Phys., 29 (1958).
[3] Ferenc Vajda, Edward Della Torre, and R D McMichael, "Demagnetized-state dependence of Henkel plots. I. The Preisach model," J. Appl. Phys., 75 (1994).