Naturally Produced Co/CoO Nanocrystalline Magnetic Multilayers: Structure and Inverted Hysteresis

Santarossa, FrancescaUniv Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece. (författare)

Naturally Produced Co/CoO Nanocrystalline Magnetic Multilayers : Structure and Inverted Hysteresis

Cobalt-based multilayers with excellent sequencing are grown via radiofrequency magnetron sputtering with the use of one Co target and natural oxidation. The Co layers are continuous, fully textured {111} and have the face centered cubic structure. At the end of deposition of each Co layer air is let to flow into the vacuum chamber via a fine (leak) valve. The top of Co is oxidized. The oxidized layers consist of cubic CoO crystallites. Near the film surface hexagonal Co(OH)(2) is also detected. Magneto-optical Kerr effect hysteresis loops show in-plane magnetized films. The magnetic saturation field in the out-of-plane measurements is large exceeding 12 kOe. This observation supports indirectly the fact that Co is face centered cubic; if it was c-axis textured hexagonal the magnetocrystalline anisotropy would be large resulting in smaller values of the saturation field. As the Co-layer thickness decreases the in-plane loops show reduced remanence, slow approach to magnetic saturation and the out-of-plane loops show inverted hysteresis and/or crossing loop features with sizeable remanence. The effects are discussed with respect to the enhanced orbital magnetic moment of Co and the antiferromagnetic coupling between Co spins at the Co/CoO interface.

Pappas, Spyridon D.Uppsala universitet,Materialfysik(Swepub:uu)spypa516 (författare)
Delimitis, AndreasCtr Res & Technol Hellas CERTH, CPERI, Thessaloniki 57001, Greece. (författare)
Sousanis, AndreasUniv Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece. (författare)
Poulopoulos, PanagiotisUniv Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece. (författare)
Univ Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece.Materialfysik (creator_code:org_t)

Ingår i:Journal of Nanoscience and Nanotechnology: American Scientific Publishers16:5, s. 4960-49671533-48801533-4899

Av författaren/redakt...: Santarossa, Fran ...; Pappas, Spyridon ...; Delimitis, Andre ...; Sousanis, Andrea ...; Poulopoulos, Pan ...

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