  Electrical tuning of magnetism is crucial for developing fast, compact,
ultra-low power electronic devices. Multiferroics offer significant potential
due to their ability to control magnetic via an electric field through
magnetoelectric coupling, especially in layered ferroelectric/ferromagnet
heterostructures. A key challenge is achieving reversible and stable switching
between distinct magnetic states using a voltage control. In this work, we
present ferroelectric tuning of room-temperature magnetism in a 2D layered
ferromagnet. The energy-efficient control consumes less than 1 fJ per operation
which is normally in the order of several aJ, resulting in a ~43% change in
magnetization. This tunable multiferroic interface and associated devices
provide promising opportunities for next-generation reconfigurable
communication systems, spintronics, sensors and memories.
