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Tilted X-ray holography of magnetic bubbles in MnNiGa lamellae

DOI: 10.1021/acsnano.0c07392 DOI Help

Authors: Luke A. Turnbull (Durham University) , Max T. Birch (Durham University; Diamond Light Source) , Angus Laurenson (University of Exeter) , Nick Bukin (University of Exeter) , Erick O. Burgos-Parra (University of Exeter) , Horia Popescu (Synchrotron SOLEIL) , Murray N. Wilson (Durham University) , Ales Stefancic (University of Warwick) , Geetha Balakrishnan (University of Warwick) , Feodor Y. Ogrin (University of Exeter) , Peter D. Hatton (Durham University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Nano

State: Published (Approved)
Published: October 2020
Diamond Proposal Number(s): 20866

Open Access Open Access

Abstract: Nanoscopic lamellae of centrosymmetric ferromagnetic alloys have recently been reported to host the biskyrmion spin texture; however, this has been disputed as the misidentication of topologically trivial type-II magnetic bubbles. Here we demonstrate resonant soft X-ray holographic imaging of topological magnetic states in lamellae of the centrosymmetric alloy (Mn1–xNix)0.65Ga0.35 (x = 0.5), showing the presence of magnetic stripes evolving into single core magnetic bubbles. We observe rotation of the stripe phase via the nucleation and destruction of disclination defects. This indicates the system behaves as a conventional uniaxial ferromagnet. By utilizing the holography with extended reference by autocorrelation linear dierential operator (HERALDO) method, we show tilted holographic images at 30° incidence confirming the presence of type-II magnetic bubbles in this system. This study demonstrates the utility of X-ray imaging techniques in identifying the topology of localized structures in nanoscale magnetism.

Journal Keywords: MnNiGa; X-ray holography; biskyrmion; topological magnetism; type-II bubble

Diamond Keywords: Ferromagnetism

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism

Added On: 02/11/2020 09:52

Discipline Tags:

Quantum Materials Physics Magnetism Materials Science Nanoscience/Nanotechnology

Technical Tags:

Scattering Resonant Soft X-ray Scattering (RSXS)