Detection of magnetic circular dichroism in amorphous materials utilizing a single-crystalline overlayer

Lin, J.; Zhong, X. Y.; Song, C.; Rusz, J.; Kocevski, V.; Xin, H. L.; Cui, B.; Han, L. L.; Lin, R. Q.; Chen, X. F.; Zhu, J.

doi:10.1103/PhysRevMaterials.1.071404

Title: Detection of magnetic circular dichroism in amorphous materials utilizing a single-crystalline overlayer

Journal Article · Wed Dec 27 00:00:00 EST 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.071404· OSTI ID:1437442

Lin, J. ^[1]; Zhong, X. Y. ^[1]; Song, C. ^[1]; Rusz, J. ^[2]; Kocevski, V. ^[3];

^[4]; Cui, B. ^[1]; Han, L. L. ^[4]; Lin, R. Q. ^[4]; Chen, X. F. ^[1]; Zhu, J. ^[1]

Tsinghua Univ., Beijing (China)
Uppsala Univ., Uppsala (Sweden)
Uppsala Univ., Uppsala (Sweden); Northwestern Univ., Evanston, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Physicists are fascinated with topological defects in solid-state materials, because by breaking the translational symmetry they offer emerging properties that are not present in their parental phases. For example, edge dislocations—the 2π phase-winding topological defects—in antiferromagnetic NiO crystals can exhibit ferromagnetic behaviors. Herein, we study how these defects could give rise to exotic topological orders when they interact with a high energy electron beam. To probe this interaction, we formed a coherent electron nanobeam in a scanning transmission electron microscope and recorded the far-field transmitted patterns as the beam steps through the edge dislocation core in [001] NiO. Surprisingly, we found the amplitude patterns of the <020> Bragg disks evolve in a similar manner to the evolution of an annular solar eclipse. Using the ptychographic technique, we recovered the missing phase information in the diffraction plane and revealed the topological phase vortices in the diffracted beams. Through atomic topological defects, the wave function of electrons can be converted from plane wave to electron vortex. This approach provides a new perspective for boosting the collection efficiency of magnetic circular dichroism spectra with high spatial resolution and understanding the relationship between symmetry breaking and exotic property of individual topological defect at atomic level.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1437442

Alternate ID(s):: OSTI ID: 1414978

Report Number(s):: BNL-204646-2018-JAAM; PRMHAR; TRN: US1900328

Journal Information:: Physical Review Materials, Vol. 1, Issue 7; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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