Abstract
A Cavendish-type torsion pendulum, having test masses with 2.5×1022 polarized electrons and "attracting" masses with 8×1023 polarized electrons, is used to search for an anomalous spin interaction of macroscopic range. Competition from magnetic forces is reduced by using ferrimagnetic Dy-Fe masses which exhibit orbital compensation of the electron spin magnetic moments. Combined with magnetic shielding, the sensitivity is 2×10-4 of the gravitational force. Fluctuations set the overall experimental limit at about 5 times this level. Our results set limits on electron spin interactions and on moments which are not of electromagnetic origin. In terms of a standard dipole-dipole form, the limit is 1.5 ×10-12 of the interaction strength between the magnetic moments of the electrons. Compared to previous results, this is a six-cold improvement.
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