Work

Nondestructive Analysis of Coercivity Distributions in Permanent Magnets with Locally Enhanced Magnetic Properties

Year: 2025

Type: article

Abstract: A nondestructive method is proposed for characterizing the local variations of coercivity in locally enhanced permanent magnets. Such magnets enable a reduction in heavy rare earth element usage by improving magnetic properties only in specific regions where required for the application in electrical machines. For quality control of such magnets, precise analysis of the coercivity distribution to support both material optimization and process reliability is required. The proposed nondestructive approach combines magnetic stray field mapping with closed‐circuit hysteresisgraph measurements at different stages of the demagnetization curve. This allows reconstruction of local coercivity variations. Validation through destructive sequential analysis confirms the method's reliability and accuracy.

Source: physica status solidi (RRL) - Rapid Research Letters

DOI: 10.1002/pssr.202500307

Authors: Maximilian Lanz, Marius Boettle, Gerhard Martinek, Gerhard Schneider, Dagmar Goll

Language: English

Topic: Magnetic Properties of Alloys

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,430

Funder: Bundesministerium für Bildung und Forschung

Award: FH-Kooperativ 1-2023: Lokal verstärkte Dauermagnete für nachhaltige und effiziente elektrische Maschinen (REfficient)