Flexomagnetism and vertically graded Néel temperature of antiferromagnetic Cr2O3 thin films

Pavlo Makushko, Tobias Kosub, Oleksandr V. Pylypovskyi (), Natascha Hedrich, Jiang Li, Alexej Pashkin, Stanislav Avdoshenko, René Hübner, Fabian Ganss, Daniel Wolf, Axel Lubk, Maciej Oskar Liedke, Maik Butterling, Andreas Wagner, Kai Wagner, Brendan J. Shields, Paul Lehmann, Igor Veremchuk, Jürgen Fassbender, Patrick Maletinsky and Denys Makarov ()
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Pavlo Makushko: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Tobias Kosub: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Oleksandr V. Pylypovskyi: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Natascha Hedrich: University of Basel
Jiang Li: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Alexej Pashkin: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Stanislav Avdoshenko: Institute for Solid State Research, Leibniz Institute for Solid State and Materials Research Dresden
René Hübner: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Fabian Ganss: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Daniel Wolf: Leibniz Institute for Solid State and Materials Research, IFW Dresden
Axel Lubk: Leibniz Institute for Solid State and Materials Research, IFW Dresden
Maciej Oskar Liedke: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Radiation Physics
Maik Butterling: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Radiation Physics
Andreas Wagner: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Radiation Physics
Kai Wagner: University of Basel
Brendan J. Shields: University of Basel
Paul Lehmann: University of Basel
Igor Veremchuk: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Jürgen Fassbender: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research
Patrick Maletinsky: University of Basel
Denys Makarov: Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Antiferromagnetic insulators are a prospective materials platform for magnonics, spin superfluidity, THz spintronics, and non-volatile data storage. A magnetomechanical coupling in antiferromagnets offers vast advantages in the control and manipulation of the primary order parameter yet remains largely unexplored. Here, we discover a new member in the family of flexoeffects in thin films of Cr2O3. We demonstrate that a gradient of mechanical strain can impact the magnetic phase transition resulting in the distribution of the Néel temperature along the thickness of a 50-nm-thick film. The inhomogeneous reduction of the antiferromagnetic order parameter induces a flexomagnetic coefficient of about 15 μB nm−2. The antiferromagnetic ordering in the inhomogeneously strained films can persist up to 100 °C, rendering Cr2O3 relevant for industrial electronics applications. Strain gradient in Cr2O3 thin films enables fundamental research on magnetomechanics and thermodynamics of antiferromagnetic solitons, spin waves and artificial spin ice systems in magnetic materials with continuously graded parameters.

Date: 2022
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DOI: 10.1038/s41467-022-34233-5

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