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Multiple low-temperature skyrmionic states in a bulk chiral magnet

DOI: 10.1038/s41535-019-0150-7 DOI Help

Authors: Lars J. Bannenberg (Delft University of Technology) , Heribert Wilhelm (Diamond Light Source) , Robert Cubitt (Institut Laue-Langevin) , Ankit Labh (Delft University of Technology) , Marcus P. Schmidt (Max Planck Institute for Chemical Physics of Solids) , Eddy Lelièvre-Berna (Institut Laue-Langevin) , Catherine Pappas (Delft University of Technology) , Maxim Mostovoy (University of Groningen) , Andrey O. Leonov (Hiroshima University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Npj Quantum Materials , VOL 4

State: Published (Approved)
Published: April 2019

Open Access Open Access

Abstract: Magnetic skyrmions are topologically protected nanoscale spin textures with particle-like properties. In bulk cubic helimagnets, they appear under applied magnetic fields and condense spontaneously into a lattice in a narrow region of the phase diagram just below the magnetic ordering temperature, the so-called A-phase. Theory, however, predicts skyrmions to be locally stable in a wide range of magnetic fields and temperatures. Our neutron diffraction measurements reveal the formation of skyrmion states in large areas of the magnetic phase diagram, from the lowest temperatures up to the A-phase. We show that nascent and disappearing spiral states near critical lines catalyze topological charge changing processes, leading to the formation and destruction of skyrmionic states at low temperatures, which are thermodynamically stable or metastable depending on the orientation and strength of the magnetic field. Skyrmions are surprisingly resilient to high magnetic fields: the memory of skyrmion lattice states persists in the field polarized state, even when the skyrmion lattice signal has disappeared. These findings highlight the paramount role of magnetic anisotropies in stabilizing skyrmionic states and open up new routes for manipulating these quasi-particles towards energy-efficient spintronics applications.

Journal Keywords: Magnetic properties and materials; Spintronics; Topological matter

Diamond Keywords: Skyrmions; Spintronics

Subject Areas: Physics, Materials


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Added On: 08/04/2019 14:11

Documents:
s41535-019-0150-7.pdf

Discipline Tags:

Materials Science Quantum Materials Physics Electronics Magnetism

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