Multiscale differential phase contrast analysis with a unitary detector

Lopatin, Sergei; Ivanov, Yurii P.; Kosel, Jürgen

doi:10.1016/j.ultramic.2015.12.008

Cited by 19 publications

(19 citation statements)

References 34 publications

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“…The observations from the MFM images agree with the previously obtained MOKE results (Figure 10) and confirm the single domain structure of the nanowire [41]. Several other techniques exist such as Lorentz microscopy [65], modified differential phase contrast microscopy [66], photoemission electron microscopy (PEEM) combined with X-ray magnetic circular dichroism (XMCD) [67,68], and electron holography [69], which are powerful characterization tools that can yield highly valuable local magnetic information.…”

Section: Magnetic Imagingsupporting

confidence: 87%

Advanced Fabrication and Characterization of Magnetic Nanowires

Mohammed¹,

Moreno²,

Kosel³

2018

Magnetism and Magnetic Materials

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Magnetic nanowires feature unique properties that have attracted the interest of different research areas from basic physics over biomedicine to data storage. The combination of crystalline and shape anisotropy is mainly responsible for the magnetic properties of the nanowires, whereby different methods for tuning those properties are available. The nanowires typically represent single-domain particles, and magnetization switching occurs via domain walls nucleated at the ends of the nanowire and traversing it. Combined with a high biocompatibility, iron or iron oxide nanowires can be used as nanorobots for biomedical applications, destroying cancer cells, or delivering drugs. The nanowires are also attractive for data storage, especially in a three-dimensional device, because of the high-domain wall speed that has been theoretically predicted. This chapter offers an introduction to the electrochemical synthesis of cylindrical nanowires in anodic aluminum oxide (AAO) templates. Template modification techniques such as barrier layer thinning, barrier layer etching, and diameter modulation are discussed. Advanced fabrication techniques of nanowires with varying structural and chemical variations such as multisegmented and core-shell nanowires are elaborated. The characterization of single nanowires encompassing physical, magnetic, and electrical techniques is covered.

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Section: Magnetic Imagingsupporting

confidence: 87%

Advanced Fabrication and Characterization of Magnetic Nanowires

Mohammed¹,

Moreno²,

Kosel³

2018

Magnetism and Magnetic Materials

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“…The detailed description of the method together with the approach to quantify the nanoscale magnetic field can be found in Ref. 39 There we demonstrated the very high spatial resolution of the VBF DPC method (around 4 nm) and its high sensitivity to magnetic fields (the signal measured could be better than 0.01 T depends on the experimental conditions).…”

Section: Methodsmentioning

confidence: 76%

Design of Intense Nanoscale Stray Fields and Gradients at Magnetic Nanorod Interfaces

Ivanov

Leliaert

Crespo

et al. 2019

ACS Appl. Mater. Interfaces

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We explore electrodeposited ordered arrays of Fe, Ni and Co nanorods embedded in anodic alumina membranes as a source of intense magnetic stray field gradients localized at the nanoscale. We perform a multiscale characterization of the stray fields using a combination of experimental methods (Magneto-optical Kerr effect, Virtual Bright Field Differential Phase Contrast Imaging) and micromagnetic simulations, and establish a clear correlation between the stray fields and the magnetic configurations of the nanorods. For uniformly magnetized Fe and Ni wires the field gradients vary following Page 2 of 33 ACS Paragon Plus Environment ACS Applied Materials & Interfaces 3 saturation magnetization of corresponding metal and the diameter of the wires. In the case of Co nanorods, very localized (~10 nm) and intense (> 1T) stray field sources are associated with the cores of magnetic vortexes. Confinement of that strong field at extremely small dimensions leads to exceptionally high field gradients up to 10 8 T/m. These results demonstrate a clear path to design and fine-tune nanoscale magnetic stray field ordered patterns with a broad applicability in key nanotechnologies, such as nanomedicine, nanobiology, nanoplasmonics and sensors.

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“…Since the diffraction patterns contain a large variety of information this approach can be used to map physical quantities such as electric or magnetic fields as well as strain. [10][11][12][13] The popularity of 4DSTEM has raised tremendously due to the improvement of digital cameras, i.e. direct detectors are capable of recording several thousand diffraction patterns per second -an acquisition rate to which the presented method has proven to be applicable.…”

Section: Comparison With Hardware Synchronizationmentioning

confidence: 99%