Calculating the magnetocaloric effect in second-order-type material by micromagnetic simulations: A case study on Co2B

SCRIPTA MATERIALIA

卷:177

Article

Ohmer, Dominik¹  Yi, Min^1,2,3,4,5  Fries, Maximilian¹  Gutfleisch, Oliver¹  Xu, Bai-Xiang¹ 

[1] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany

[2] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China

[3] Nanjing Univ Aeronaut & Astronaut, Key Lab Intelligent Nano Mat & Devices, Minist Educ, Nanjing 210016, Jiangsu, Peoples R China

[4] Nanjing Univ Aeronaut & Astronaut, Coll Aerosp Engn, Nanjing 210016, Jiangsu, Peoples R China

[5] Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China

关键词: Magnetocaloric effect;    Micromagnetic simulation;    Arrott-Noakes equation;    Microstructure;    Entropy change;   

DOI  :  10.1016/j.scriptamat.2019.10.039

来源: Elsevier

【 摘 要 】

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 Co2B as model material, we found that increasing magnetocrystalline anisotropy facilitates higher isothermal entropy changes (Delta S-T). The grain size reduction results in increased Delta S-T for constant saturation magnetization (M-S), while Delta S-T decreases for a reduction of Ms with reduced grain size. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free