Combined kinetic and Bean–Rodbell approach for describing field-induced transitions in LaFe11.6Si1.4 alloys. (22nd January 2021)

• Record Type: Journal Article
• Authors: Moreno-Ramírez, L M; Blázquez, J S; Radulov, I A; Skokov, K P; Gutfleisch, O; Franco, V; Conde, A
• Is Part Of: Journal of physics. Volume 54:Number 13(2021)
• Publication Date: 2021-01-22
• Subjects: magnetocaloric effect -- kinetic process -- hysteresis -- first-order phase transition; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abd583
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: 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 LaFe11.6 Si1.4 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.