Sources.

Global recycling statistics

62 million tonnes of e-waste generated worldwide in 2022.
22.3 percent of global e-waste documented as formally collected and recycled in 2022.
1 percent of global rare-earth element demand met by e-waste recycling, reported in 2024.

Sony’s WH-1000XM4 specifications list a neodymium magnet for that headphone model.

Ames National Laboratory explains the differences between induction motors, permanent-magnet motors and alternative magnet materials.