SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Functional Antiferromagnetism I

MA 18.3: Vortrag

Dienstag, 28. März 2023, 15:30–15:45, HSZ 02

Optically Triggered Néel Vector Manipulation of a Metallic Antiferromagnet Mn₂Au under Strain — Vladimir Grigorev¹, Mariia Filianina¹, Yaryna Lytvynenko¹, Sergei Sobolev¹, Amrit Raj Pokharel¹, •Amon P. Lanz¹, Alexey Sapozhnik², Armin Kleibert³, Stanislav Bodnar⁴, Petr Grigorev⁵, Yurii Skourski⁶, Mathias Kläui¹, Hans-Joachim Elmers¹, Martin Jourdan¹, and Jure Demsar¹ — ¹JGU, Mainz, Germany — ²École Polytechnique, Lausanne, Switzerland — ³PSI, Villingen, Switzerland — ⁴TUM, Munich, Germany — ⁵Aix-Marseille Université, Marseille, France — ⁶HZDR, Dresden, Germany

The absence of stray fields, their insensitivity to external magnetic fields, and ultrafast dynamics make antiferromagnets promising candidates for active elements in spintronic devices. Here, we demonstrate manipulation of the Néel vector in the metallic collinear antiferromagnet Mn₂Au by combining strain and femtosecond laser excitation. Applying tensile strain along either of the two in-plane easy axes and locally exciting the sample by a train of femtosecond pulses, we align the Néel vector along the direction controlled by the applied strain. The dependence on the laser fluence and strain suggests the alignment is a result of optically triggered depinning of 90^∘ domain walls and their motion in the direction of the free energy gradient, governed by the magneto-elastic coupling. The resulting, switchable state is stable at room temperature and insensitive to magnetic fields. Such an approach may provide ways to realize robust high-density memory device with switching time scales in the picosecond range.