Altermagnetic multiferroics represent an emerging class of materials that exhibit unique symmetry-protected spin splitting in the absence of net magnetization, holding great promise for spintronic applications. However, achieving deterministic and nonvolatile electric control over their spin-splitting properties remains both a fundamental challenge and a technologically pivotal goal. Here, using first-principles calculations on a $\mathrm{MnPS}{\mathrm{e}}_3/\mathrm{TiGe}{\mathrm{S}}_3$ heterostructure, we demonstrate that sliding ferroelectricity acts as a powerful symmetry knob, enabling reversible switching between $d$-wave and $i$-wave altermagnetic states. This interwave transition is driven by interlayer sliding, which breaks the threefold rotational symmetry and leads to pronounced changes in spin-splitting anisotropy, spin transport behavior, and magneto-optical Kerr signals. Furthermore, we uncover a triple coupling mechanism among intrinsic ferroelectric polarization, sliding ferroelectricity, and altermagnetic symmetry, providing enhanced control over the altermagnetic phase landscape. Our work establishes sliding ferroelectricity as a generic and efficient approach for symmetry engineering in altermagnets and paves the way toward electrically reconfigurable altermagnetic devices.

Close

PrevNext

View figure in article

• Spin waves
• Altermagnets
• Multiferroics