Understanding and optimization of hard magnetic compounds from first principles

Autor: Takashi Miyake, Yosuke Harashima, Taro Fukazawa, Hisazumi Akai
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 543-556 (2021)
Druh dokumentu: article
ISSN: 1468-6996
1878-5514
14686996
DOI: 10.1080/14686996.2021.1935314
Popis: First-principles calculation based on density functional theory is a powerful tool for understanding and designing magnetic materials. It enables us to quantitatively describe magnetic properties and structural stability, although further methodological developments for the treatment of strongly correlated 4f electrons and finite-temperature magnetism are needed. Here, we review recent developments of computational schemes for rare-earth magnet compounds, and summarize our theoretical studies on Nd2Fe14B and RFe12-type compounds. Effects of chemical substitution and interstitial dopants are clarified. We also discuss how data-driven approaches are used for studying multinary systems. Chemical composition can be optimized with fewer trials by the Bayesian optimization. We also present a data-assimilation method for predicting finite-temperature magnetization in wide composition space by integrating computational and experimental data.
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