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arXiv 0704.3970cond-mat.mtrl-scicond-mat.other
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铀基多层膜II的研究磁性能

A study of uranium-based multilayers: II. Magnetic properties

R Springell, S W Zochowski, R C C Ward, M R Wells, S D Brown, L Bouchenoire, F Wilhelm, S Langridge, W G Stirling, G H Lander

摘要:

用SQUID磁强计和极化中子反射率测量方法研究了U/Fe、U/Co和U/Gd多层膜的磁性。在10 K下,在磁场从-70 kOe到70 kOe的范围内测量了磁化强度的场依赖性。的磁化演变的温度依赖性的研究进行了选择的U/Gd样品。对U/Fe、U/Co样品(室温)和U/Gd样品(10 K)进行了4.4kOe的PNR。磁性'死'层约15埃观察U/Fe和U/Co样品,符合图片的相互扩散界面。一个大的减少磁矩,恒定的Gd层的厚度在很宽的范围内,被发现为U/Gd系统(约4玻尔磁子相比,7.63块金属)。这可以被理解的基础上的Gd层的柱状生长机制所产生的Gd矩的钉扎。有效各向异性的研究表明,垂直磁各向异性可能发生在多层膜厚的U和薄Gd层。居里温度的降低被观察到作为Gd层厚度的函数,与有限尺寸标度行为一致。

英文摘要:

SQUID magnetometry and polarised neutron reflectivity measurements have been employed to characterise the magnetic properties of U/Fe, U/Co and U/Gd multilayers. The field dependence of the magnetisation was measured at 10K in magnetic fields from -70kOe to 70kOe. A temperature dependent study of the magnetisation evolution was undertaken for a selection of U/Gd samples. PNR was carried out in a field of 4.4kOe for U/Fe and U/Co samples (at room temperature) and for U/Gd samples (at 10K). Magnetic 'dead' layers of about 15 Angstrom were observed for U/Fe and U/Co samples, consistent with a picture of interdiffused interfaces. A large reduction in the magnetic moment, constant over a wide range of Gd layer thicknesses, was found for the U/Gd system (about 4 Bohr magnetons compared with 7.63 for the bulk metal). This could be understood on the basis of a pinning of Gd moments arising from a column-like growth mechanism of the Gd layers. A study of the effective anisotropy suggests that perpendicular magnetic anisotropy could occur in multilayers consisting of thick U and thin Gd layers. A reduction in the Curie temperature was observed as a function of Gd layer thickness, consistent with a finite-size scaling behaviour.

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