通过相干软X射线共振磁散射研究FePd磁条中的磁滞效应。

Hysteresis effect in FePd magnetic stripes studied by coherent soft X-ray resonant magnetic scattering.

作者信息

Chesnel K, van der Laan G, Livet F, Beutier G, Marty A, Belakhovsky M, Haznar A, Collins S P

机构信息

ALS, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

出版信息

J Synchrotron Radiat. 2004 Nov 1;11(Pt 6):469-75. doi: 10.1107/S090904950402309X. Epub 2004 Oct 22.

DOI:10.1107/S090904950402309X

PMID:15496734

Abstract

An FePd thin film sample, showing magnetic stripe domains as imaged by magnetic force microscopy, has been measured by soft X-ray resonant magnetic scattering in reflection geometry. Illumination with coherent radiation, produced by inserting a 20 microm pinhole in front of the sample, leads to a magnetic speckle pattern in the scattered intensity that gives access to the domain morphology. Application of an in-plane magnetic field for a few seconds gives a strong change in the observed intensity fluctuations, which indicates a large degree of variation between the two patterns taken before and after field exposure. From the speckle pattern we calculate a degree of coherence of beta = 0.5 for the incident beam.

摘要

通过反射几何结构中的软X射线共振磁散射测量了一个FePd薄膜样品，该样品通过磁力显微镜成像显示出磁条纹畴。在样品前插入一个20微米的针孔产生的相干辐射照射，导致散射强度中出现磁散斑图案，从而可以了解畴的形态。施加面内磁场几秒钟会使观察到的强度波动发生强烈变化，这表明场暴露前后所取的两种图案之间存在很大程度的差异。从散斑图案中，我们计算出入射光束的相干度β = 0.5。