Abstract
The van der Waals (vdW) layered multiferroics, which host simultaneous ferroelectric and magnetic orders, have attracted attention not only for their potentials to be utilized in nanoelectric devices and spintronics, but also offer alternative opportunities for emergent physical phenomena. To date, the vdW layered multiferroic materials are still very rare. In this work, we have investigated the magnetic structure and magnetoelectric (ME) effects in Co5鈦�(Te鈦3)4鈦l2, a promising multiferroic compound with antiferromagnetic (AFM) N茅el point 饾憞饾憗鈭�18 K. The neutron-powder diffraction reveals the noncoplanar AFM state with preferred N茅el vector along the 饾憪 axis, while a spin reorientation occurring between 8 and 15 K is identified, which results from the distinct temperature dependence of the nonequivalent Co site's moment in Co5鈦�(Te鈦3)4鈦l2. Moreover, it is found that Co5鈦�(Te鈦3)4鈦l2 is one of the best vdW multiferroics studied so far in terms of the multiferroic performance. The measured linear ME coefficient exhibits the emergent oscillation dependence of the angle between magnetic field and electric field, and the maximal value is as big as 45 ps/m. It is suggested that Co5鈦�(Te鈦3)4鈦l2 is an appreciated platform for exploring the emergent multiferroicity in vdW layered compounds.
