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- W2971232012 abstract "Electron energy-loss magnetic chiral dichroism (EMCD) has the potential to measure magnetic properties of the materials at atomic resolution but the complex distribution of magnetic signals in the zone axis and the overlapping diffraction discs at higher beam convergence angles make the EMCD signal acquisition challenging. Recently, the use of ventilator apertures to acquire the EMCD signals with atomic resolution was proposed. Here we give the experimental demonstration of several types of ventilator apertures and obtain a clear EMCD signal at beam semiconvergence angles of 5 mrad. To simplify the experimental procedures, we propose a modified ventilator aperture which not only simplifies the complex scattering conditions but reduces the influence of lens aberrations on the EMCD signal as compared to the originally proposed ventilator apertures. In addition, this modified aperture can be used to analyze magnetic crystals with various symmetries and we demonstrate this feature by acquiring EMCD signals on different zone axis orientations of an Fe crystal. With the same aperture we obtain EMCD signals with convergence angles corresponding to atomic resolution electron probes. After the theoretical demonstration of the EMCD signal on a zone axis orientation at high beam convergence angles, this work thus overcomes the experimental and methodological hurdles and enables atomic resolution EMCD on the zone axis by using apertures.Received 31 August 2019Revised 21 April 2020Accepted 21 April 2020DOI:https://doi.org/10.1103/PhysRevResearch.2.023330Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMagnetic orderMagnetismPhysical SystemsFunctional materialsPropertiesAtomic PropertiesMagnetic momentTechniquesElectron magnetic circular dichroismTransmission electron microscopyCondensed Matter, Materials & Applied Physics" @default.
- W2971232012 created "2019-09-05" @default.
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- W2971232012 date "2020-06-12" @default.
- W2971232012 modified "2023-10-18" @default.
- W2971232012 title "Atomic resolution energy-loss magnetic chiral dichroism measurements enabled by patterned apertures" @default.
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- W2971232012 doi "https://doi.org/10.1103/physrevresearch.2.023330" @default.
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