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Observation of magnetization distribution in a correlated spin glass system : amorphous Tb-Co magnetic films

机译:相关自旋玻璃系统中的磁化分布观察:非晶态Tb-Co磁性膜

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摘要

The magnetization distribution in sputtered random-anisotropy TbCo 3 amorphous films was observed by transmission electron microscopy at room, low and high temperature. In the as-grown films, about 8 x 10 -8 m thick, a disordered structure on a scale of 10-7 m, consistent with the Imry and Ma picture for a correlated spin glass, is observed at room temperature. This structure is unaffected by cooling but is irreversibly and progressively simplified on heating. Domain wall contrast is reversed, with no change in wall positions, when going through the compensation temperature of about 270 K. In thinned fragments, the domain structure is qualitatively different, due to terbium loss near the surfaces.
机译:通过透射电子显微镜在室温,低温和高温下观察溅射的随机各向异性TbCo 3非晶膜中的磁化分布。在成膜的薄膜中,在室温下观察到约8 x 10 -8 m厚,在10-7 m范围内的无序结构,与相关旋转玻璃的Imry和Ma图片一致。该结构不受冷却的影响,但是在加热时不可逆且逐渐简化。当经过约270 K的补偿温度时,畴壁的对比度被反转,而壁的位置没有变化。在变薄的碎片中,由于表面附近的loss损失,畴结构在质量上有所不同。

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