We study interlayer magnetic interactions between a ferrimagnetic insulator with perpendicular magnetic anisotropy ${\text{Tb}}_3{\text{Fe}}_5{\mathrm{O}}_{12}$ (TbIG) and an in-plane magnetized ferromagnetic conductor CoFeB. We identify a chiral interlayer coupling, enabled by symmetry breaking associated with a uniaxial in-plane anisotropy in the CoFeB layer. This coupling gives rise to a chiral exchange bias effect on both layers, tunable via their relative vector magnetization orientation. Temperature-controlled and current-induced Joule heating experiments demonstrate relaxation from a chiral-coupling unfavorable to a favored configuration, allowing external field-free and deterministic perpendicular magnetization reversal. These findings highlight insulating ferrimagnetic garnet/ferromagnet bilayers as a promising platform for chiral spintronic functionalities in memory and logic devices.

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• Chirality-induced spin selectivity
• Dzyaloshinskii-Moriya interaction
• Exchange bias
• Magnetic coupling
• Ferrimagnets
• Ferromagnets
• Magnetic insulators
• Magnetic multilayers