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首页> 外文期刊>IEEE Transactions on Magnetics >Exchange Bias Induced by the Spin Glass-Like Surface Spins in Sputter Deposited Fe3O4 Thin Films
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Exchange Bias Induced by the Spin Glass-Like Surface Spins in Sputter Deposited Fe3O4 Thin Films

机译：溅射沉积的Fe 3 O 4 薄膜中类似自旋玻璃的表面自旋引起的交换偏置

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摘要

The exchange bias in the reactive sputtered polycrystalline Fe3O4 thin films of thicknesses 50 and 150 nm is studied. X-ray diffraction, laser Raman, and selected area electron diffraction studies confirm the formation of the Fe3O4 single phase. The high-resolution transmission electron microscope images show the presence of well-defined crystallites. The presence of the exchange bias effect is mainly due to the existence of a significant exchange coupling between the core spins and the spin glass-like surface spins of the grains. The temperature dependence of the magnitude of the exchange bias field HEB shows two exponential regimes of which the lower temperature regime corresponds to the spin freezing effect below 50 K. The first magnetization curves measured after zero field cooling show S-shape below the spin freezing temperature. The presence of superparamagnetism and spin freezing has been investigated through the field cooled (FC) and zero FC magnetization measurements. Temperature dependence of coercivity also indicates the spin freezing effect. Hence, the observed large exchange bias of the samples at lower temperatures is due to the freezing of the surface spins.
机译：研究了厚度为50和150 nm的反应性溅射多晶Fe 3 O 4 薄膜的交换偏压。 X射线衍射，激光拉曼光谱和选择区域电子衍射研究证实了Fe 3 O 4 单相的形成。高分辨率透射电子显微镜图像显示存在定义明确的微晶。交换偏置效应的存在主要是由于晶粒的核心自旋与类自旋玻璃状表面自旋之间存在明显的交换耦合。交换偏压场H EB 的大小与温度的关系显示出两个指数形式，其中较低的温度形式对应于50 K以下的自旋冻结效应。零磁场冷却后测得的第一条磁化曲线显示低于自旋冻结温度的S形。通过磁场冷却（FC）和零FC磁化强度测量，研究了超顺磁性和自旋冻结的存在。矫顽力的温度依赖性还表明自旋冻结效应。因此，在较低温度下观察到的样品较大的交换偏差是由于表面自旋的冻结所致。

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