Magnetic soft x-ray holography study of focused ion beam-patterned Co/Pt multilayers

Streit-Nierobisch, S.; Stickler, Daniel; Gutt, Christian; Stadler, Lorenz-M.; Stillrich, Holger; Menk, Christian; Frömter, Robert; Tieg, C.; Leupold, O.; Oepen, Hans Peter; Grübel, G.

doi:10.1063/1.3246724

Cited by 42 publications

(32 citation statements)

References 26 publications

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“…To obtain a real-space reconstruction of the magnetic domain pattern, a reverse Fourier transform is applied to the difference of both images, 16 an example of which is shown in Fig. 2͑c͒.…”

Section: -mentioning

confidence: 99%

holographic X-ray microscopy

2014

Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik

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We present a new x-ray microscopy technique based on Fourier transform holography ͑FTH͒, where the sample is separate from the optics part of the setup. The sample can be shifted with respect to the holography optics, thus large-scale or randomly distributed objects become accessible. As this extends FTH into a true microscopy technique, we call it x-ray holographic microscopy ͑XHM͒. FTH allows nanoscale imaging without the need for nanometer-size beams. Simple Fourier transform yields an unambiguous image reconstruction. We demonstrate XHM by studying the magnetic domain evolution of a Co/Pt multilayer film as function of locally varied iron overlayer thickness.

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Section: -mentioning

confidence: 99%

holographic X-ray microscopy

2014

Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik

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“…Imaging and quantifying perpendicular exchange biased systems by soft x-ray holography and spectroscopy C. Tieg, 1 E. Jiménez, 2 J. Camarero, 2,3,a͒ J. Vogel, 4 C. Arm, 5 B. Rodmacq, 6 E. Gautier, 6 S. Auffret, 6 B. Delaup, 6 G. Gaudin, 6 B. Dieny, 6 The magnetic properties of perpendicular exchange biased ferromagnetic ͑FM͒/antiferromagnetic ͑AFM͒ ͓Pt/ Co͔ n / IrMn systems were investigated by a new set-up combining element-selective soft x-ray holography and spectroscopy measurements. The holography experiments allow imaging the magnetization reversal of an exchange biased FM layer with an equivalent Co thickness below 5 nm in real space and in external magnetic fields, and provide direct evidence of its asymmetric nature.…”

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Imaging and quantifying perpendicular exchange biased systems by soft x-ray holography and spectroscopy

Tieg

Jiménez²,

Camarero³

et al. 2010

Appl. Phys. Lett.

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“…At these highly brilliant and highly coherent femtosecond sources, lensless imaging techniques using XMCD [51], [52] hold great promise as a reciprocal space alternative to lens-based techniques for single shot and femtosecond magnetic X-ray imaging.…”

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confidence: 99%

Imaging Nanoscale Magnetic Structures With Polarized Soft X-Ray Photons

Fischer

2010

IEEE Photonics J.

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Imaging nanoscale magnetic structures and their fast dynamics is scientifically interesting and technologically of highest relevance. The combination of circularly polarized soft X-ray photons, which provide a strong X-ray magnetic circular dichroism effect at characteristic X-ray absorption edges, with a high-resolution soft X-ray microscope utilizing Fresnel zone plate optics allows, in a unique way, the study of the stochastical behavior in the magnetization reversal process of thin films and the ultrafast dynamics of magnetic vortices and domain walls in confined ferromagnetic structures. Future sources of femtosecond-short and highly intense soft X-ray photon pulses hold the promise of magnetic imaging down to fundamental magnetic length and time scales.The magnetic properties of matter are one of the most vibrant research areas [1], [2], not only because the phenomenon of magnetism itself is scientifically very attractive, but it also has immense implications to modern magnetic storage and sensor device technologies. Nanomagnetism investigates magnetism approaching fundamental magnetic length scales which are given by material specific properties such as exchange lengths or anisotropy constants being in the fewnanometer regime for common materials.To minimize the competing magnetic interactions, e.g., exchange and anisotropy, in ferromagnetic systems, the ground state is often not the single domain state, where all spins are aligned parallel, but breaks up into multiple magnetic domains [3]. The transition region between domains is referred to as a domain wall (DW). In confined geometries, e.g., micrometer-sized disk structures, the spin configuration forms a magnetic vortex (MV) [4], [5], with a singularity occurring at the center, i.e., the MV core, which overcomes shape anisotropy and points perpendicular to the disk plane. The sizes of DWs and vortex cores are proportional to magnetic exchange lengths.With a typical bit size of only a few tens of nanometers in high-density magnetic storage media of 1 Tb/in 2 and the capability to artificially fabricate nanoscale magnetic structures either top-down or bottom-up, e.g., by state-of-the-art lithographical techniques [6], an abundance of analytical tools to characterize the magnetic behavior of these structures has been developed. Imaging methods are very attractive, since they give detailed and direct insight into the mechanisms involved.There are several interaction mechanisms to control and manipulate the spin structure on a nanoscale. For example, reversal of the magnetic moments can be achieved by applying an

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Magnetic soft x-ray holography study of focused ion beam-patterned Co/Pt multilayers

Cited by 42 publications

References 26 publications

holographic X-ray microscopy

holographic X-ray microscopy

Imaging and quantifying perpendicular exchange biased systems by soft x-ray holography and spectroscopy

Imaging Nanoscale Magnetic Structures With Polarized Soft X-Ray Photons

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