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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Role of vacancies in transport and magnetic properties of nickel ferrite thin films
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Role of vacancies in transport and magnetic properties of nickel ferrite thin films

机译：空位在镍铁氧体薄膜传输和磁性中的作用

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Nickel ferrite thin films were synthesized by pulsed laser deposition. It was determined that the monotonic increase in saturation magnetization and the non-monotonic increase in electrical conductivity depend on the oxygen partial pressure during the growth of the thin films. A substantial reduction in magnetization was found which ranged between 0.4% and 40% of the bulk value as the oxygen partial pressure increased from 0.2 × 10~(-6) Torr to 500 mTorr during the deposition of the films. There was a three orders of magnitude increase in conductivity for the sample prepared under the most oxygen deficient environment (partial pressure of oxygen 0.2 × 10~(-6) Torr). These variations in saturation magnetization and conductivity are described within the framework of cation/oxygen vacancies in an inverse spinel nickel ferrite structure. The changes in the electronic structure due to the presence of the vacancies were investigated using X-ray photoelectron spectroscopy, which confirmed the formation of lower valent Ni for the samples prepared in an oxygen deficient atmosphere.
机译：通过脉冲激光沉积合成镍铁氧体薄膜。已确定饱和磁化强度的单调增加和电导率的非单调增加取决于薄膜生长过程中的氧分压。发现在膜的沉积过程中，随着氧分压从0.2×10〜（-6）托增加到500 mTorr，磁化强度显着降低，占体积值的0.4％至40％。在最缺氧的环境（氧气分压为0.2×10〜（-6）Torr）下制备的样品，电导率增加了三个数量级。在反尖晶石镍铁氧体结构的阳离子/氧空位的框架内描述了饱和磁化强度和电导率的这些变化。使用X射线光电子能谱研究了由于空位的存在而引起的电子结构的变化，这证实了在缺氧气氛中制备的样品形成了较低价的Ni。

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