Magnetic Small Angle X-Ray Scattering

Abstract

We present first experimental results of the extension of X-ray Magnetic Circular Dichroism (X-MCD) to Small Angle X-ray Scattering (SAXS). The purpose of this study is to determine size distributions and correlations lengths in the nanometer range of magnetic precipitates in granular systems. Magnetic scattering curves obtained with a GdFe system at the Gd La edge are compared with reference measurements taken with Anomalous Small Angle X-ray Scattering (ASAXS) at the Fe K-edge. The profle of the scattering curves indicate a correlation maximum. The magnetic scattering intensity can be explained within the frame of X-MCD results and magnetic contributions to the anomalous scattering factors f' and f".

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

“…The images were taken using a 2D charge coupled device (CCD) camera. For each XPCS image consecutive images are performed with opposing helicities (XMCD) or polarization orientations (XMLD) and are combined in post-processing to increase the signal, as per the method outlined by Fischer et al 36 . In this protocol, the intensity of each image of the final image, I, is calculated using…”

“…These are presented in normalised form as I Norm (Q) = (I(Q) I Min )/(I Max I Min ). A log-normal distribution was fitted to each data set to identify the position of the peak 36 , Q Peak = Q 0 e ! 2 , where Q 0 is the centre of the distribution and !…”

Two-dimensional resonant magnetic soft X-ray scattering set-up for extreme sample environment

“…Synchrotron radiation small-angle X-ray scattering (SAXS) is a promising approach in order to tackle this issue because through wavelength tuning it can be made highly element sensitive and relevant to the interesting nanometer length scales. In a previous work the hard X-ray regime has been explored using MASAXS (magnetic anomalous SAXS) at the Fe K-edge and Gd L 3,2 -edges (Fischer et al, 1997). To the best of our knowledge it is the only report dealing with high-energy SAXS experiments in a magnetic contrast mode.…”

Soft x‐ray techniques to study mesoscale magnetism

“…An early imaging microscope at BESSY provided the first images of magnetic structure, in the form of stripe domains in Gd/Fe multilayers having perpendicular anisotropy [9], much like those on the cover. Such studies are currently conducted at the ALS [26], and have expanded to include patterned films with perpendicular anisotropy [27,28], field-dependent domain behavior [29,25], and extended [30] and patterned films having inplane anisotropy.…”

“…These large resonant MO effects enable different approaches to study magnetic structure or heterogeneity that can be categorized as microscopy or scattering [1]. Direct images of magnetic structure result from photo-emission electron microscopes [4,8] and zone-plate microscopes [9,10]. Scattering techniques extended into the soft x-ray include familiar specular reflection that laterally averages over structure but can provide depth-resolved information, and diffuse scattering and diffraction that provide direct information about lateral magnetic structure.…”