We report the latest results of searching for possible new macro-scale spin-spin-velocity-dependent forces (SSVDFs) based on specially designed iron-shielded SmCo5 (ISSC) spin sources and a spin exchange relaxation free (SERF) co-magnetometer. The ISSCs have high net electron spin densities of about 1.7×1021 cm−3, which mean high detecting sensitivity; and low magnetic field leakage of about ∼mG level due to iron shielding, which means low detecting noise. With help from the ISSCs, the high sensitivity SERF co-magnetometer, and the similarity analysis method, new constraints on SSVDFs with forms of V6+7, V8, V15, and V16 have been obtained, which represent the tightest limits in force range of 5 cm -- 1 km to the best of our knowledge.
Cite
@article{arxiv.1803.02813,
title = {New Experimental Limits on Exotic Spin-Spin-Velocity-Dependent Interactions By Using SmCo$_5$ Spin Sources},
author = {Wei Ji and Yao Chen and Changbo Fu and Ming Ding and Jiancheng Fang and Zhigang Xiao and Kai Wei and Haiyang Yan},
journal= {arXiv preprint arXiv:1803.02813},
year = {2019}
}