  Using the determinant quantum Monte-Carlo method, we elucidate the strain
tuning of edge magnetism in zigzag graphene nanoribbons. Our intensive
numerical results show that a relatively weak Coulomb interaction may induce a
ferromagnetic-like behaviour with a proper strain, and the edge magnetism can
be enhanced greatly as the strain along the zigzag edge increases, which
provides another way to control graphene magnetism even at room temperature.
