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We report an experimental search for an exotic spin-spin-velocity-dependentinteraction between polarized electrons of Rb atoms and polarized electrons ofa solid-state mass, violating both the time-reversal and parity symmetries.This search targets a minute effective magnetic field induced by theinteraction. A spin-exchange relaxation-free (SERF) magnetometer based on anoptically polarized Rb vapor is the key element for both a source of polarizedelectrons and a high-sensitivity detector. A dysprosium iron garnet (DyIG)serves as the polarized mass, with an extremely small magnetization at thecritical temperature around 240 K and a high spin density. To reduce themagnetization, one of major systematic effects, a home-built cooling systemcontrols the mass temperature. To our knowledge, this is the first search foran exotic spin-dependent interaction using the compensated ferrimagnet DyIG asa polarized mass. The experiment set the most stringent limit on theelectron-electron coupling strength in the centimeter interaction range, inparticular $g_V^e g_V^e <10^{4}$ at $\lambda=2$ cm.

Experimental search for an exotic spin-spin-velocity-dependent interaction using an optically polarized vapor and a rare-earth iron garnet