High-resolution neutron depolarization microscopy of the ferromagnetic transitions in Ni3Al and HgCr2Se4 under pressure

Jorba, Pau; Schulz, Michael; Hussey, Daniel S.; Abir, Muhammad; Seifert, Marc; Tsurkan, V.; Loidl, A.; Pfleiderer, C.; Khaykovich, Boris

doi:10.1016/j.jmmm.2018.11.086

Cited by 21 publications

(17 citation statements)

References 59 publications

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“…The anticipated low cost and high degree of adaptability have moved us to focus on CRLs, but much of the formalism established and some of the new modalities introduced are also relevant for objectives based on, for example, zone plates or Wolter optics. [For a recent full-field microscopy demonstration experiment using Wolter optics, see Jorba et al (2019)].…”

Section: Discussionmentioning

confidence: 99%

“…With such beams, it is natural to base bright-field imaging studies on placing a 2D detector downstream of but in close proximity to the sample. This approach enables a large variety of contrast to be explored, including attenuation contrast (Kallmann, 1948;Strobl et al, 2009), phase contrast (Strobl et al, 2008) and more specialized techniques such as spectral imaging (Lehmann et al, 2014), Bragg edge contrast for mapping of stresses (Santisteban et al, 2001) and phases (Steuwer et al, 2004;Woracek et al, 2014), extinction contrast for mapping of large grains (Cereser et al, 2017), and some versions of polarized neutron imaging for visualizing magnetic field distributions (Sales et al, 2019) and magnetic domains (Kardjilov et al, 2008;Schulz et al, 2010;Strobl et al, 2019;Jorba et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Full-field neutron microscopy based on refractive optics

Leemreize¹,

Knudsen²,

Birk³

et al. 2019

J Appl Cryst

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Placing a compound refractive lens (CRL) as an objective in a neutron beam generates new possibilities for 2D and 3D nondestructive mapping of the structure, strain and magnetic domains within extended objects. A condenser setup is introduced that allows correction for the lateral chromatic aberration. More generally, for full‐field microscopy the loss in performance caused by the chromatic aberration can be more than offset by introducing arrays of CRLs and exploiting the fact that the field of view can be much larger than the physical aperture of the CRL. Comments are made on the manufacture of such devices. The potential use is illustrated by comparisons between state‐of‐the‐art instrumentation and suggested approaches for bright‐field microscopy, small‐angle neutron scattering microscopy, grain mapping and mapping of stresses. Options are discussed for depth‐resolved imaging inspired by confocal light microscopy. Finally, experimental demonstrations are given of some of the basic properties of neutron full‐field imaging for a single CRL.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Full-field neutron microscopy based on refractive optics

Leemreize¹,

Knudsen²,

Birk³

et al. 2019

J Appl Cryst

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“…It enables to investigate whether the magnetic sample contains non-parallel field components with respect to the initial beam polarization, which cause depolarization effects in the neutron beam. This method has proven to be a powerful tool in many different applications such as mapping of the Curie temperature of samples undergoing a ferromagnetic–paramagnetic phase transition 11,12 . A somewhat more sophisticated approach is applied for the polarized neutron imaging, where the beam can be assumed to remain polarized even after the interaction with the sample and the local spin rotation is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry

et al. 2019

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The intrinsic magnetic moment of a neutron, combined with its charge neutrality, is a unique property which allows the investigation of magnetic phenomena in matter. Here we present how the utilization of a cold polarized neutron beam in neutron grating interferometry enables the visualization and characterization of magnetic properties on a microscopic scale in macroscopic samples. The measured signal originates from the phase shift induced by the magnetic potential. Our method enables the detection of previously inaccessible magnetic field gradients, in the order of T cm −1 , extending the probed range by an order of magnitude. We visualize and quantify the phase shift induced by a well-defined square shaped uniaxial magnetic field and validate our experimental findings with theoretical calculations based on Hall probe measurements of the magnetic field distribution. This allows us to further extend our studies to investigations of inhomogeneous and anisotropic magnetic field distribution.

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“…The peculiar feature of neutrons as charge neutral particles carrying a magnetic moment has been exploited in the study of magnetic phenomena [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In neutron imaging, the interaction of the neutron magnetic moment with magnetic fields is exploited in various ways to image macroscopic magnetic fields and structural features [9,[18][19][20][21][22][23][24][25][26][27][28][29].…”

mentioning

confidence: 99%

“…Thus, an optimized setup, with the polarization analyzer turned by 90°compared to our setup, would provide the unique opportunity to measure simultaneously the dark-field contrast of the transversal beam splitting and the spatial modulation of the spin precession. In the field of direct observations of magnetic domains, the setup enables the simultaneous visualization of domain walls by dark-field contrast imaging [32][33][34][35][36][37][38][39] and the measurement of the domain magnetization and orientation by polarization contrast [9,[20][21][22][23][24]28,31]. Additionally, the instrumentation can be used to extend spatially resolved quantitative smallangle scattering studies performed with dark-field contrast imaging [41,44] to magnetic materials and structures by probing all components of magnetic scattering.…”

mentioning

confidence: 99%