Giant Perpendicular Magnetic Anisotropy Of An Ir Monolayer On A Nial(001) Surface
PHYSICAL REVIEW B(2009)
摘要
Using the state-of-the-art full potential linearized augmented plane-wave method, we have investigated the magnetic properties of Os and Ir monolayer (ML) film on NiAl(001) surface. It has been found that the one ML of Os and Ir film can have ferromagnetic ground state with magnetic moment of 0.35 and 0.64 mu(B) on Ni terminated surface, whereas both films display no sign of magnetic state on Al terminated surface. In addition, the surface Ni atom has an induced magnetic moment of 0.26 mu(B) in Ir/NiAl(001), while only 0.09 mu(B) is observed in Os/NiAl(001). We attribute the existence of magnetism to the interaction between 5d of adlayer and 3d of surface Ni. Moreover, we have obtained that the Os/NiAl(001) and Ir/NiAl(001) films show a perpendicular magnetic anisotropy (PMA). Surprisingly, it appears that the Ir/NiAl(001) has a giant PMA energy of 7.18 meV.
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关键词
adsorbed layers, aluminium alloys, APW calculations, ferromagnetic materials, iridium, magnetic anisotropy, magnetic moments, nickel alloys, osmium, surface magnetism
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