  Two-dimensional (2D) transition-metal oxide perovskites greatly expand the
field of available 2D multifunctional material systems. Here, based on density
functional theory calculations, we predicted the presence of ferromagnetism
orders accompanying with an insulator-metal phase transition in bilayer
$KNbO_{3}$ and $KTaO_{3}$ by applying strain engineering and/or external
electric field. Our results will contribute to the applications of few-layer
transition metal oxide perovskites in the emerging spintronics and
straintronics.
