Calculating the magnetocaloric effect in second-order-type material by micromagnetic simulations: A case study on Co2B. (1st March 2020)

• Record Type: Journal Article
• Authors: Ohmer, Dominik; Yi, Min; Fries, Maximilian; Gutfleisch, Oliver; Xu, Bai-Xiang
• Is Part Of: Scripta materialia. Number 177(2020)
• Page Start: 218
• Page End: 222
• Publication Date: 2020-03-01
• Subjects: Magnetocaloric effect -- Micromagnetic simulation -- Arrott–Noakes equation -- Microstructure -- Entropy change; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.039
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: We propose a calculation scheme which integrates micromagnetic simulations and the Arrott–Noakes equation for the investigation of the influence of microstructure and magnetocrystalline anisotropy on the magnetocaloric effect (MCE) in second-order magnetic phase transition materials. Using the Arrott–Noakes equation, the micromagnetic simulation results are extrapolated to temperatures above Curie temperature and applied to MCE calculations. With Co2 B as model material, we found that increasing magnetocrystalline anisotropy facilitates higher isothermal entropy changes ( Δ S T ). The grain size reduction results in increased Δ S T for constant saturation magnetization ( M S ), while Δ S T decreases for a reduction of M S with reduced grain size.