Magnonic holographic imaging of magnetic microstructures (original) (raw)
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Shining light on magnetic microstructures
Superlattices and Microstructures, 2005
The increasing interest in micro-and nano-magnetism requires new instruments to examine the collective behavior of laterally structured ferromagnetic (FM) thin films. We demonstrate the possibility to extend the established Bragg-MOKE technique, which measures the Kerr effect on off-specular diffracted polarized laser light to soft x-rays. The shorter wavelength, which allows investigating smaller structures, and the element selectivity of the resonant scattering make soft x-rays an attractive tool for studying patterned ferromagnetic heterostructures. We illustrate this technique on permalloy islands and on exchange biased iron islands on antiferromagnetic CoO as two model systems. The results so far are in agreement with other experimental techniques and show the feasibility of off-specular resonant magnetic soft x-ray scattering.
Journal of Applied Physics, 2016
Magneto-optical imaging films (MOIFs) were used for the study of magnetic stray field distributions above topographically and thermomagnetically patterned permanent magnet films and other miniature elements that could be used in magnetic micro-systems. Calibrated external bias fields were applied to the samples in situ to simplify the graduation procedure, to expand the measurement range and to minimize the measurement errors. Both uniaxial and planar MOIF were used to make quantitative measurements. A scheme for the fast reconstruction of magnetic serial sections of non-uniform field profiles is proposed. The usefulness of biased MOIF imaging is illustrated by a number of specific examples, such as mechanical hole-drilling adapted to the case of magnetic analysis, dynamic range expansion beyond the limits set by MOIF saturation, rendering surface magnetic flux variations at the microscale and in the presence of strong background.
Electron Holography of Magnetic Nanostructures
2005
Electron holography is an electron microscope imaging technique that permits quantitative measurement of magnetic fields with spatial resolution approaching the nanometer scale. The theoretical background and usual experimental setup for electron holography are first briefly described. Applications of the technique to magnetic materials and nanostructures are then discussed in more detail. Future prospects are summarized.
Quantitative Magnetic Imaging Using Magneto-Optical Method
Advanced Nondestructive Evaluation II (Volume II) - Proceedings of the International Conference on ANDE 2007, 2008
A magneto-optical (MO) microscope that uses the polarization modulation method was developed for quantitative MO imaging. In addition, Bi substitute yttrium iron garnet films prepared by a metal organic decomposition method were combined with the MO microscope to visualize magnetic flux strayed from a sample. Quantitative images of magnetic flux strayed from patterned superconducting thin films were measured, and images of current distribution were also deduced from the MO image.
Observation of Micro-Magnetic Structures by Synchrotron Radiation Photoelectron Emission Microscopy
Journal of the Physical Society of Japan, 2013
Examples of the application of photoelectron emission microscopy (PEEM) combined with synchrotron radiation excitation are reviewed. In particular, the combination study of PEEM and X-ray magnetic dichroism spectroscopy is very valuable for magnetic domain imaging. According to the demands of the industry, such as the production of magnetic recording media, the application method becomes very important. In this review, several examples of studies using magnetic circular and/or linear dichroism spectroscopy for ferro-and antiferromagnetic materials are introduced. In addition, pump-probe time-resolved PEEM is introduced. These methods allow us to measure the dynamical motion of micro-magnetic structures in mesoscopic size magnets in response to the field pulse in the sub-nanosecond range.