Combined kinetic and Bean–Rodbell approach for describing fieldinduced transitions in LaFe11.6Si1.4 alloys

2021/02/16

Experimental (symbols) and modeled (lines) magnetization and demagnetization processes at 192 K together with the pure
Bean–Rodbell model without kinetic effects (a) and for the rest of studied temperatures (190 and 194 K) (b) for the suction casted
LaFe11.6Si1.4 sample at 50 Oe s−1. The same comparison for the suction casted LaFe11.4Cr0.2Si1.4 sample at 50 Oe s−1 (c) and the induction
melted LaFe11.6Si1.4 sample at 10 Oe s−1 and 100 Oe s−1 (d). For interpretation of the color legend, the reader is referred to the electronic
version of this article. — Experimental (symbols) and modeled (lines) magnetization and demagnetization processes at 192 K together with the pure Bean–Rodbell model without kinetic effects (a) and for the rest of studied temperatures (190 and 194 K) (b) for the suction casted LaFe11.6Si1.4 sample at 50 Oe s−1. The same comparison for the suction casted LaFe11.4Cr0.2Si1.4 sample at 50 Oe s−1 (c) and the induction melted LaFe11.6Si1.4 sample at 10 Oe s−1 and 100 Oe s−1 (d). For interpretation of the color legend, the reader is referred to the electronic version of this article.

L. M. Moreno-Ramírez, J. S. Blázquez, I. A. Radulov, K. P. Skokov, O. Gutfleisch, V. Franco, A. Conde

Journal of Physics D: Applied Physics 54, 135003, (2021).

We propose a combination of the Kolmogorov–Johnson–Mehl–Avrami nucleation and growth theory and the Bean–Rodbell model to describe the field-induced transition in LaFe11.6Si1.4 alloys. The approach is applied to a set of bulk samples undergoing first-order transitions produced by different routes and including doping effects. The kinetic analysis of both magnetization and demagnetization processes reveals a nucleation and three-dimensional interface-controlled growth for these alloys. Introducing the kinetic process between the metastable and stable solutions of the Bean–Rodbell model, the field dependence of the magnetization/demagnetization processes, including magnetic hysteresis for different magnetic field sweeping rates, is better reproduced than with the pure model.

DOI: 10.1088/1361-6463/abd583