Defect Manipulation for the Coercivity Enhancement of Nd-Fe-B Permanent Magnets

9 Pages Posted: 17 Nov 2023

See all articles by Qais Ali

Qais Ali

University for Continuing Education Krems

Johann Fischbacher

University for Continuing Education Krems

Alexander Kovacs

University for Continuing Education Krems

Harald Oezelt

University for Continuing Education Krems

Markus Gusenbauer

University for Continuing Education Krems

Heisam Moustafa

University for Continuing Education Krems

David Böhm

University for Continuing Education Krems

Leoni Breth

University for Continuing Education Krems

Thomas Schrefl

University for Continuing Education Krems

Abstract

The demand for rare-earth based permanent magnets is expected to rise for various climate friendly technologies. This motivates for the search of better designed permanent magnets with optimal use of rare-earth elements without compromising the key magnetic properties. We simulate Nd$_2$Fe$_{14}$B based permanent magnet to study the effects of microstructure on coercivity ($H_{\rm C}$). We demonstrate a fast method to compute the microstrucutral parameters in numerical micromagnetics. We report a novel  magnetic reversal process, which is primarily driven by defect thickness. By selective replacement of the defect with a hard magnetic phase $H_{\rm C}$ is expected to rise by 1.5 times to that of single grain model with soft defect. This study is extended to a multigrain polycrystal model. Our systematic approach helps in identifying specific microstructural features pertinent for enhancement of coercivity. This work provides implications for future work to design improved defect engineered permanent magnets for green technologies.

Keywords: Coercivity, Magnetization, micromagnetics, Defects, permanent magnets

Suggested Citation

Ali, Qais and Fischbacher, Johann and Kovacs, Alexander and Oezelt, Harald and Gusenbauer, Markus and Moustafa, Heisam and Böhm, David and Breth, Leoni and Schrefl, Thomas, Defect Manipulation for the Coercivity Enhancement of Nd-Fe-B Permanent Magnets. Available at SSRN: https://ssrn.com/abstract=4628986 or http://dx.doi.org/10.2139/ssrn.4628986

Qais Ali (Contact Author)

University for Continuing Education Krems ( email )

Johann Fischbacher

University for Continuing Education Krems ( email )

Alexander Kovacs

University for Continuing Education Krems

Harald Oezelt

University for Continuing Education Krems ( email )

Markus Gusenbauer

University for Continuing Education Krems ( email )

Heisam Moustafa

University for Continuing Education Krems ( email )

David Böhm

University for Continuing Education Krems ( email )

Leoni Breth

University for Continuing Education Krems ( email )

Thomas Schrefl

University for Continuing Education Krems ( email )

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