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arXiv 1103.0367cond-mat.mtrl-sci
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NiPt薄膜中的反常霍尔效应

Anomalous Hall effect in NiPt thin films

T. Golod, A. Rydh, V. M. Krasnov

摘要:

研究了溅射沉积的不同Ni浓度的Ni_xPt_(1-x)薄膜的霍尔效应。分析了温度、磁场和角度的依赖关系,得到了NiPt薄膜的相图。研究发现,亚临界Ni浓度的薄膜在低温下表现出团簇玻璃行为,在凝固温度以下具有垂直磁各向异性。具有过临界Ni浓度的薄膜是具有平行各向异性的铁磁。在临界浓度下,膜的状态强烈受挫。这种薄膜表现出倾斜磁化,易磁化轴作为温度的函数旋转。磁性通过连续的顺磁-团簇玻璃-铁磁转变出现,而不是单个的二级相变。但最值得注意的是,特殊的霍尔效应在临界浓度下改变了符号。我们认为,这与在正常的金属-铁磁量子相变的合金的电子结构的重建。

英文摘要:

We study Hall effect in sputtered NixPt1-x thin films with different Ni concentrations. Temperature, magnetic field and angular dependencies are analyzed and the phase diagram of NiPt thin films is obtained. It is found that films with sub-critical Ni concentration exhibit cluster-glass behavior at low temperatures with a perpendicular magnetic anisotropy below the freezing temperature. Films with over-critical Ni concentration are ferromagnetic with parallel anisotropy. At the critical concentration the state of the film is strongly frustrated. Such films demonstrate canted magnetization with the easy axis rotating as a function of temperature. The magnetism appears via consecutive paramagnetic - cluster glass - ferromagnetic transitions, rather than a single second-order phase transition. But most remarkably, the extraordinary Hall effect changes sign at the critical concentration. We suggest that this is associated with a reconstruction of the electronic structure of the alloy at the normal metal - ferromagnet quantum phase transition.

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