Einstein-de Haas Effect - Wolfram Demonstrations Project
demonstrations.wolfram.com
The only experimental work ever published by Albert Einstein was carried out in 1915 in collaboration with Wander Johannes de Haas who was the soninlaw of H A Lorentz Einstein had long contemplated Ampegraveres conjecture in 1820 that magnetism is caused by circulation of electric charge This Demonstration describes a technologically updated version of the original Einsteinndashde Haas experiment

Until now I only learned an electron cannot be spinning in the classical sense, because it would have to be spinning faster than the speed of light (plus ‘spin 1/2’ has no classical sense.) This made me assume quantum ‘angular momentum’ sums to magnetism instead-of and without classical angular momentum.