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Dec 8 – 9, 2022
Marriott
Europe/Berlin timezone

Non-collinear long-range coupling in modulated manganites.

Dec 8, 2022, 5:10 PM
25m
Marriott

Marriott

Talk (20 min + 5 min discussion) Quantum Phenomena Quantum Phenomena

Speaker

Laura Guasco

Description

Non-volatile and tunable non-collinear magnetic structures in thin films are gaining increasing importance for several spintronics applications, such as triplet spin-valves, or devices based on the topological Hall effect. Non-volatile non-collinearity can be tailored in heterostructures that exhibit exchange bias or long-range couplings, as the RKKY. We report on the experimental observation of a novel, complex non-collinear structure based on the imprinting of canted antiferromagnetism of the spacer to the neighboring ferromagnetic layers [1]. We studied superlattices composed of optimally doped (x=0.4) ferromagnetic La$_{1-x}$Sr$_{x}$MnO$_{3}$ of fixed thickness and overdoped (x=0.8) spacer of variable thickness. High hole diffusion over several unit cells creates depth-modulated manganite homojunctions, with an overall complex magnetism that differs from that of its singular components. In particular, at intermediate spacer thickness, we obtained a non-collinear synthetic antiferromagnet, which we investigated by means of polarized neutron reflectometry and diffraction. The novel long-range non-collinear structure is a non-volatile phase which is easily tuned with application of small magnetic fields (H<100 mT).

[1]. Guasco, L., Khaydukov, Y., Kim, G., et al., Emergent Magnetic Fan Structures in Manganite Homojunction Arrays. Adv. Mater. 2022, 34, 2202971. https://doi.org/10.1002/adma.202202971

Primary author

Co-authors

Alexei Vorobiev (Uppsala university) Anton Devishvili (Uppsala universtiy) Bernhard Keimer (MPI for Solid State Research) Gennady Logvenov (MPI for Solid State Research) Georg Christiani (MPI for Solid State Research) Gideok Kim (Center for integrated nanostructure physics) Peter Wochner (MPI for Solid State Research) Thomas Keller (MPI for Solid State Research, Stuttgart) Yury Khaydukov (Max-Planck Institute for Solid State Research)

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