Nanoscale three-dimensional reconstruction of electric and magnetic stray fields around nanowires

Lubk, Axel; Wolf, Daniel; Simon, Paul; Wang, C.; Sturm, Sebastian; Felser, Claudia

doi:10.1063/1.4900826

Cited by 20 publications

(16 citation statements)

References 42 publications

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“…Yu et al [42] proposed a three tilt series reconstruction of A to improve the reconstruction and avoid errors due to singular surfaces; however, this approach is experimentally difficult to implement. Lubk et al used off-axis electron holography to reconstruct the magnetic stray fields around Co 2 FeGa nanowires [43]. They focused on the stray field by excluding the interior of the sample in their tomographic reconstruction scheme.…”

Section: Vector-field Electron Tomography (Vfet)mentioning

confidence: 99%

Recent advances in Lorentz microscopy

Phatak

Petford‐Long

Graef

2016

Current Opinion in Solid State and Materials Science

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Lorentz transmission electron microscopy (LTEM) has evolved from a qualitative magnetic domain observation technique to a quantitative technique for the determination of the magnetization state of a sample. In this review article, we describe recent developments in techniques and imaging modes, including the use of spherical aberration correction to improve the spatial resolution of LTEM into the single nanometer range, and novel in situ observation modes. We review recent advances in the modeling of the wave optical magnetic phase shift as well as in the area of phase reconstruction by means of the Transport of Intensity Equation (TIE) approach, and discuss vector field electron tomography, which has emerged as a powerful tool for the 3D reconstruction of magnetization configurations. We conclude this review with a brief overview of recent LTEM applications.

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Section: Vector-field Electron Tomography (Vfet)mentioning

confidence: 99%

Recent advances in Lorentz microscopy

Phatak

Petford‐Long

Graef

2016

Current Opinion in Solid State and Materials Science

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“…Several techniques are available for this purpose, for example SQUIDs 11 – 16 , magnetometers based on air coils driven by an alternating current or the Hall effect 17 – 19 , magnetic force microscopy-based methods 20 , 21 , cantilever magnetometry 22 – 25 , spinpolarized scanning tunnelling microscopy 26 , 27 , magnetometry based on nitrogen-vacancy defects 28 and electron holography 1 , 29 . These techniques have been employed to study magnetization reversal processes in nanoparticles induced by current 26 , 27 or by an external magnetic field 12 , 21 , 22 and to investigate the magnetic stray fields of nanoparticles 1 , 29 . Besides experimental techniques, theoretical simulations are used as well to gain insight into the nanoparticle’s magnetic behavior 30 – 34 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of individual Co2FeGa Heusler nanoparticles studied at room temperature by a highly sensitive co-resonant cantilever sensor

Körner

Reiche

Ghunaim

et al. 2017

Sci Rep

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The investigation of properties of nanoparticles is an important task to pave the way for progress and new applications in many fields of research like biotechnology, medicine and magnetic storage techniques. The study of nanoparticles with ever decreasing size is a challenge for commonly employed methods and techniques. It requires increasingly complex measurement setups, often low temperatures and a size reduction of the respective sensors to achieve the necessary sensitivity and resolution. Here, we present results on how magnetic properties of individual nanoparticles can be measured at room temperature and with a conventional scanning force microscopy setup combined with a co-resonant cantilever magnetometry approach. We investigate individual Co2FeGa Heusler nanoparticles with diameters of the order of 35 nm encapsulated in carbon nanotubes. We observed, for the first time, magnetic switching of these nanoparticles in an external magnetic field by simple laser deflection detection. Furthermore, we were able to deduce magnetic properties of these nanoparticles which are in good agreement with previous results obtained with large nanoparticle ensembles in other experiments. In order to do this, we expand the analytical description of the frequency shift signal in cantilever magnetometry to a more general formulation, taking unaligned sensor oscillation directions with respect to the magnetic field into account.

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“… 20 , 21 Recently, electromagnetic stray fields around Co 2 FeGa Heusler NWs have been revealed successfully. 22 Very recently, a 3D observation of magnetic vortex cores in stacked ferromagnetic discs using EHT was reported. 23 The work describes in a condensed manner how existing programs such as the IMOD package 24 are used to reconstruct the 3D magnetic induction map.…”

Section: Introductionmentioning

confidence: 99%

3D Magnetic Induction Maps of Nanoscale Materials Revealed by Electron Holographic Tomography

et al. 2015

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The investigation of three-dimensional (3D) ferromagnetic nanoscale materials constitutes one of the key research areas of the current magnetism roadmap and carries great potential to impact areas such as data storage, sensing, and biomagnetism. The properties of such nanostructures are closely connected with their 3D magnetic nanostructure, making their determination highly valuable. Up to now, quantitative 3D maps providing both the internal magnetic and electric configuration of the same specimen with high spatial resolution are missing. Here, we demonstrate the quantitative 3D reconstruction of the dominant axial component of the magnetic induction and electrostatic potential within a cobalt nanowire (NW) of 100 nm in diameter with spatial resolution below 10 nm by applying electron holographic tomography. The tomogram was obtained using a dedicated TEM sample holder for acquisition, in combination with advanced alignment and tomographic reconstruction routines. The powerful approach presented here is widely applicable to a broad range of 3D magnetic nanostructures and may trigger the progress of novel spintronic nonplanar nanodevices.

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Nanoscale three-dimensional reconstruction of electric and magnetic stray fields around nanowires

Cited by 20 publications

References 42 publications

Recent advances in Lorentz microscopy

Recent advances in Lorentz microscopy

Magnetic properties of individual Co2FeGa Heusler nanoparticles studied at room temperature by a highly sensitive co-resonant cantilever sensor

3D Magnetic Induction Maps of Nanoscale Materials Revealed by Electron Holographic Tomography

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