Elektrodepolama ile Üretilen Co, Ni ve CoNi Alaşımlı İnce Filmlerin Yapısal ve Manyetik Özelliklerinin İncelenmesi

Abstract

Elektrodepolama yöntemi ile nanoparçacıkların ince film kaplama olarak üretimi diğer yöntemlere göre daha kolay ve ucuz yapılmaktadır. Bunun nedeni, ince film üretiminin banyo içeriğindeki bileşenlerin ve üretim şarlarının değişimi ile kontrol edilebilmesidir. Bu çalışmada, elektrodepolama yöntemiyle, kobalt sülfat (CoSO4.7H2O), nikel sülfat (NiSO4.6H2O), nikel (II) klorür (NiCl2.6H2O) ve borik asit (H3BO3) den oluşan banyo kompozisyonundan saf Co, Ni ve CoNi alaşımlı ince filmler üretildi. Üretilen ince filmlerin kristal yapısı (XRD), morfolojisi (SEM), element bileşimi (ICP) ve manyetik özellikleri (VSM) incelendi. Kaplama banyosunun kimyasal özellikleri de dönüşümlü voltametri (CV) yöntemiyle incelendi. İnce filmlerin manyetizasyon ölçümleri + 75000 Oe ile -75000 Oe arasında manyetik alan uygulanarak yapıldı ve histerezis döngüleri elde edildi. Üretilen Co, Ni ve CoNi filmleri ferromanyetik malzeme özellikleri gösterdi. Bu alaşımların koversite (Hc), kalıcı mıknatıslanma (Mr) ve doyum mıknatıslanma (Ms) değerleri; kobalt miktarı, manyeto kristal anizotropi ve tane boyutundan önemli ölçüde etkilendi. Yapılan çalışmada, banyo bileşimi kontrol edilerek sert ve yumuşak manyetik özelliklere sahip malzemelerin üretilebileceği anlaşıldı.

Keywords

• elektrodepozisyon
• histerezis döngüsü
• kobalt-nikel alaşımı
• manyetizasyon
• ince filmler

Investigation of Structural and Magnetic Properties of Co, Ni and CoNi Alloy Thin Films by Fabricated with Electrodeposition

Abstract

The production of nanoparticles as thin film coating performed with electrodeposition method is easier and cheaper than other methods. Because, thin film production can be controlled with the change of ingredients in the bath composition. In this study, Co, Ni, and CoNi alloy thin films were fabricated with electrodeposition method through the bath composition that consists of cobalt sulphate (CoSO4.7H2O), nickel sulphate (NiSO4.6H2O), nickel (II) chloride (NiCl2 6H2O) and boric acid (H3BO3). Crystal structure (XRD), morphological (SEM), elemental composition (ICP) and magnetic properties (VSM) of the fabricated thin films were investigated. Chemical properties of coating bath (CV) was examined as well. Magnetization measurements of the thin films were performed by applying magnetic fields between + 75000 Oe and -75000 Oe and then hysteresis loops were obtained. The Co, Ni, and CoNi films showed ferromagnetic material properties. Coercivity (Hc), permanent magnetization (Mr), saturation magnetization (Ms) values of these alloys were significantly affected by the amount of the cobalt, magneto crystal anisotropy and grain size. It was understood that some materials having hard and soft magnetic properties can be fabricated by controlling the bath composition.

Keywords

• electrodeposition
• hydrogen evolution
• cobalt-nickel alloy
• magnetization
• thin films

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