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Curvilinear Magnetism: Fundamentals and Applications

Makarov, D.

There is one aspect, which is in common to the majority of fundamentally appealing and technologically relevant novel magnetic materials, namely their non-collinear magnetic textures like spin spirals, chiral domain walls or skyrmions [1]. These textures are typically driven by the Dzyaloshinskii-Moriya interaction (DMI). Recently, curvature effects emerged as a novel mean to design chiral magnetic properties by relying on extrinsic parameters, e.g. geometry of thin films [2]. In particular, novel effects occur when the magnetization is modulated by curvature leading to new magnetization configurations and is implications on the spin dynamics due to topological constraints. Advances in this novel field solely rely on the understanding of the fundamentals behind the modifications of magnetic responses of 3D-curved magnetic thin films [3-5] and nanowires [6,7]. The lack of an inversion symmetry and the emergence of a curvature induced effective anisotropy and DMI are characteristic of curved surfaces, leading to curvature-driven magnetochiral effects and topologically induced magnetization patterning [8,9]. The application potential of 3D-shaped objects is currently being explored as mechanically reshapeable magnetic field sensorics [10] for flexible interactive electronics [11-13], magnetic field sensors [14-18], curvilinear magnetoelectrics for memory devices [19], spin-wave filters and high-speed racetrack memory devices [20]. To advance in this research field, novel theoretical methods and fabrication/characterization techniques [21-24]. The fundamentals as well as application relevant aspects of curvilinear nanomagnets will be covered in this presentation.

[1] D. Sander, DM et al., “The 2017 Magnetism Roadmap”, J. Phys. D 50, 363001 (2017).
[2] R. Streubel, DM et al., “Magnetism in curved geometries”, J. Phys. D 49, 363001 (2016).
[3] Y. Gaididei et al., “Curvature Effects in Thin Magnetic Shells”, Phys. Rev. Lett. 112, 257203 (2014).
[4] V. Kravchuk, DM et al., “Multiplet of Skyrmion States on a Curvilinear Defect: Reconfigurable Skyrmion Lattices”, Phys. Rev. Lett. 120, 067201 (2018).
[5] O. V. Pylypovskyi, DM et al., “Chiral Skyrmion and Skyrmionium States Engineered by the Gradient of Curvature”, Phys. Rev. Appl. 10, 064057 (2018).
[6] O. M. Volkov, DM et al., “Mesoscale Dzyaloshinskii-Moriya interaction: geometrical tailoring of the magnetochirality”, Scientific Reports 8, 866 (2018).
[7] O. M. Volkov, DM et al., “Experimental observation of exchange-driven chiral effects in curvilinear magnetism”, Phys. Rev. Lett. 123, 077201 (2019).
[8] O. V. Pylypovskyi, DM et al., “Coupling of Chiralities in Spin and Physical Spaces: The Möbius Ring as a Case Study”, Phys. Rev. Lett. 114, 197204 (2015).
[9] J. A. Otalora et al., “Curvature-Induced Asymmetric Spin-Wave Dispersion”, Phys. Rev. Lett. 117, 227203 (2016).
[10] D. Makarov et al., “Shapeable magnetoelectronics”, Appl. Phys. Rev. 3, 011101 (2016).
[11] S. Canon Bermudez, DM et al., “Magnetosensitive e-skins with directional perception for augmented reality”, Science Advances 4, eaao2623 (2018).
[12] S. Canon Bermudez, DM et al., “Electronic-skin compasses for geomagnetic field driven artificial magnetoreception and interactive electronics”, Nature Electronics 1, 589 (2018).
[13] J. Ge, DM et al., “A bimodal soft electronic skin for tactile and touchless interaction in real time”, Nature Comm. 10, 4405 (2019).
[14] D. Karnaushenko, DM et al., “Self-assemled on-chip integrated giant magneto-impedance sensorics”, Adv. Mater. 27, 6582 (2015).
[15] G. Lin, DM et al., “A highly flexible and compact magnetoresistive analytic device”, Lab Chip 14, 4050 (2014).
[16] N. Münzenrieder, DM et al., “Entirely flexible on-site conditioned magnetic sensorics”, Adv. Electron. Mater. 2, 1600188 (2016).
[17] C. Becker et al., “Self-assembly of highly sensitive 3D magnetic field vector angular encoders”, Science Advances 5, eaay7459 (2019).
[18] M. Kondo et al., “Imperceptible magnetic sensor matrix system integrated with organic driver and amplifier circuits”, Science Advances 6, eaay6094 (2020)
[19] O. M. Volkov, DM et al., “Concept of artificial magnetoelectric materials via geometrically controlling curvilinear helimagnets”, J. Phys. D: Appl. Phys. 52, 345001 (2019).
[20] M. Yan et al., “Beating the Walker Limit with Massless Domain Walls in Cylindrical Nanowires”, Phys. Rev. Lett. 104, 057201 (2010).
[21] R. Streubel, DM et al., “Retrieving spin textures on curved magnetic thin films with full-field soft X-ray microscopies”, Nature Comm. 6, 7612 (2015).
[22] T. Kosub, DM et al., “Purely antiferromagnetic magnetoelectric random access memory”, Nature Comm. 8, 13985 (2017).
[23] M. Huth et al., “Focused electron beam induced deposition meets materials science”, Microelectron. Engineering 185-186, 9 (2018).
[24] M. Nord, DM et al., “Strain Anisotropy and Magnetic Domains in Embedded Nanomagnets”, Small 15, 1904738 (2019).

Keywords: curvilinear magnetism; shapeable magnetoelectronics

  • Invited lecture (Conferences) (Online presentation)
    The 2020 Magnetism and Magnetic Materials Conference, 04.11.2020, Palm Beach, USA

Permalink: https://www.hzdr.de/publications/Publ-32007
Publ.-Id: 32007


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