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Naturally Produced Co/CoO Nanocrystalline Magnetic Multilayers : Structure and Inverted Hysteresis
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- Santarossa, Francesca (författare)
- Univ Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece.
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- Pappas, Spyridon D. (författare)
- Uppsala universitet,Materialfysik
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- Delimitis, Andreas (författare)
- Ctr Res & Technol Hellas CERTH, CPERI, Thessaloniki 57001, Greece.
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- Sousanis, Andreas (författare)
- Univ Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece.
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- Poulopoulos, Panagiotis (författare)
- Univ Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece.;Univ Patras, Dept Mat Sci, Patras 26504, Greece.
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Univ Patras, Sch Engn, Lab High Tech Mat, Patras 26504, Greece;Univ Patras, Dept Mat Sci, Patras 26504, Greece. Materialfysik (creator_code:org_t)
- American Scientific Publishers, 2016
- 2016
- Engelska.
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Ingår i: Journal of Nanoscience and Nanotechnology. - : American Scientific Publishers. - 1533-4880 .- 1533-4899. ; 16:5, s. 4960-4967
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Magnetic Multilayers
- Cobalt
- Cobalt Oxide
- Inverted Hysteresis
- Thin Films
- Sputtering
- Natural Oxidation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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