Zero-magnetization ferromagnet induced by hydrogenation

A new zero-magnetization ferromagnet (ZMF), SmNiAlH 1.17 , was synthesized by hydrogenation from SmNiAl. Our experiments demonstrated that SmNiAlH 1.17 is the ZMF of Sm compound obtained by intercalating a non-magnetic element H. The Curie temperature of SmNiAlH 1.17 is T C ∼ 75 K and the compensation temperature is T c o m p ∼ 38 K, at which the orbital contribution to the magnetic moment is balanced out by the spin one. The large magnetocrystalline anisotropy of SmNiAlH 1.17 results in a tremendous diamagnetic effect in the field cooling temperature dependent magnetization, M F C ( T ) , at T < T c o m p .