Polimer ince filmlerin manyetik özelliklerinin araştırılması
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Date
2014
Authors
Güneş, Şenol
Journal Title
Journal ISSN
Volume Title
Publisher
Uludağ Üniversitesi
Abstract
Bu tezde, üç farklı polimer içerisine katkılanan baryum ferrit (BF) nano parçacıkların yapısal, elektriksel ve manyetik özellikleri incelenmiştir. Yapısal incelemelerde XRD ve AFM, elektriksel incelemelerde I-V ve C-V ölçümleri ve manyetik incelemelerde ise VSM ve MFM teknikleri kullanılmıştır. Yapısal incelemelerde, baryum ferrit katkılı polimer ince filmlerin çok küçük kristal boyutlarına sahip oldukları belirlenmiştir. Yapılan AFM ölçümlerinde ise polimer filmlerin yüzey pürüzlülük değerlerinin 16 nm ile 240 nm arasında değiştiği gözlemlenmiştir. En düşük yüzey pürüzlülük değeri P(VA)-BF örneğinde elde edilmiştir. Elektriksel ölçümler oda sıcaklığında gerçekleştirilmiştir. Ortalama engel yüksekliği akım-gerilim ölçümlerinden 0,68±0,02 eV, kapasitans-gerilim ölçümlerinden de 0,75±0,02 eV olarak elde edilmiştir Polimer filmlerin VSM ölçümlerinden histeresis eğrileri elde edilmiştir. Histeresis eğrileri incelendiğinde polimer filmlerin ferromanyetik özellik gösterdikleri görülmektedir. En yüksek doyum mıknatıslanma değerine sahip örnek P(VA)-BF olarak ölçülmüştür. MFM resimlerinde gözlenen parlak ve mat bölgeler mıknatıslanma yönlerini belirtmektedir.
In this thesis, the structural, electrical and magnetic properties of three different type polymer films doped with barium ferrite nano particles have been investigated. XRD and AFM techniques were used for structural investigations. I-V and C-V measurements were used for electrical investigations and VSM and MFM were used for investigation of magnetic properties. In structural investigations, polymer films doped with barium ferrite have a very small crystalline size. The AFM results showed that the range of the polymer films surface roughness value is between 16 nm and 240 nm. The lowest surface roughness value was obtained in P(VA)-BF. Electrical measurements were carried out at room temperature. The average barriers heights of 0,68±0,02 eV and 0,75±0,02 eV was obtained from current-voltage and capacitance-voltage measurements, respectively. The hysteresis curves of the polymer films were obtained by VSM measurement. As can be seen from hysteresis curves, polymer films show ferromagnetic behavior. The highest saturation magnetization value was measured in P(VA)-BF. The bright and dark areas in MFM image is represented magnetization direction.
In this thesis, the structural, electrical and magnetic properties of three different type polymer films doped with barium ferrite nano particles have been investigated. XRD and AFM techniques were used for structural investigations. I-V and C-V measurements were used for electrical investigations and VSM and MFM were used for investigation of magnetic properties. In structural investigations, polymer films doped with barium ferrite have a very small crystalline size. The AFM results showed that the range of the polymer films surface roughness value is between 16 nm and 240 nm. The lowest surface roughness value was obtained in P(VA)-BF. Electrical measurements were carried out at room temperature. The average barriers heights of 0,68±0,02 eV and 0,75±0,02 eV was obtained from current-voltage and capacitance-voltage measurements, respectively. The hysteresis curves of the polymer films were obtained by VSM measurement. As can be seen from hysteresis curves, polymer films show ferromagnetic behavior. The highest saturation magnetization value was measured in P(VA)-BF. The bright and dark areas in MFM image is represented magnetization direction.
Description
Keywords
Polimerler, Baryum ferrit, Manyetik özellikler, Nano yapılar, Polymers, Barium ferrite, Magnetic properties, Nanoparticles
Citation
Güneş, Ş. (2014). Polimer ince filmlerin manyetik özelliklerinin araştırılması. Yayınlanmamış yüksek lisans tezi. Uludağ Üniversitesi Fen Bilimleri Enstitüsü.