Effect of Demagnetization Method on Remnance Magnetization States in Metallic Ferromagnets

Parametric plots of the remagnetization versus demagnetization remnances, commonly called Henkel plots, were constructed for four metallic ferromagnets. These were compared to Wohlfarth’s simple model for noninteracting particles [1]. Three different paths to a net zero magnetization state (AC and two types of DC demagnetization) were explored for all the samples and in addition two of the samples were thermally demagnetized. These results present a useful comparison between metallic and particulate ferromagnetic systems, and how fundamental differences in their magnetization processes affect subsequent measurements. While adherence of our data to Wohlfarth’s model was poor for several paths to zero magnetization, many similarities between our data and models including magnetic interactions were found [2, 3].

[1] E P Wohlfarth. Journal of Applied Physics, 29:7376, 1958.
[2] Ferenc Vajda, Edward Della Torre, and R D McMichael. Journal of Applied Physics, 75:7376, 1994.
[3] J Garca-Otero, M Porto, and J Rivas. Journal of Applied Physics, 87:7376, 2000.