Magnetic ground states for bent nanotubes

Mancilla-Almonacid, D.; Castro, M. A.; Fonseca, Jakson M.; Altbir, D.; Allende, S.; Carvalho-Santos, Vagson L.

doi:10.1016/j.jmmm.2020.166754

Cited by 13 publications

(3 citation statements)

References 43 publications

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“…[177,179,[374][375][376][377][378] Further nonvolatile memory devices could be realized using topologically protected states: skyrmions on magnetic spherical shells [33] or curvilinear bumps [38,39,379] and domain walls in Möbius rings. [31] The curvature-induced effects define the appearance of specific topological magnetic states in nanotori [153,182,183,380] and nanotubes [381][382][383] as well as influence skyrmion propagation along magnetic nanotubes [384] and curved racetracks. [385] The curved geometries could be functional parts of artificial magnetoelectric media, which is based on curvilinear helimagnets sandwiched between two piezoelectric layers.…”

Section: Characterizationmentioning

confidence: 99%

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

et al. 2021

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condensed matter physics, including cell membranes, [1] nematic crystals, [2,3] superfluids, [4] semiconductors, [5][6][7][8] ferromagnets, [9] and superconductors. [10,11] Currently, much attention is paid to strongly correlated electronic systems, for example, ferromagnets and superconductors, as they provide a unique tool to manipulate the topology of coexisting vector and scalar fields, associated with geometries of conventional systems.Until recently, in the case of magnetism, the influence of the geometry on the spin vector fields was addressed primarily by the design of the sample boundaries. This approach naturally brings the shape anisotropy to the system and leads to the formation of specific spin textures, for example, magnetic vortices [12] and antivortices [13] as well as provides control over the dynamics of the topologically nontrivial magnetic solitons. [14][15][16][17][18] This discussion also tackles the state of the art in modern experimental antiferromagnetism, where the design of the sample topography and boundaries allows to control the domain wall states. [19][20][21][22] With the development of novel fabrication techniques allowing to realize complex 3D architectures, not only the boundary effects but also the extrinsic geometrical properties (e.g., local curvatures) can be addressed rigorously for the case of ferromagnets [23][24][25][26][27] as well as superconductors. [28][29][30] The explored effects are directly related to the interplay between the Traditionally, the primary field, where curvature has been at the heart of research, is the theory of general relativity. In recent studies, however, the impact of curvilinear geometry enters various disciplines, ranging from solid-state physics over soft-matter physics, chemistry, and biology to mathematics, giving rise to a plethora of emerging domains such as curvilinear nematics, curvilinear studies of cell biology, curvilinear semiconductors, superfluidity, optics, 2D van der Waals materials, plasmonics, magnetism, and superconductivity. Here, the state of the art is summarized and prospects for future research in curvilinear solid-state systems exhibiting such fundamental cooperative phenomena as ferromagnetism, antiferromagnetism, and superconductivity are outlined. Highlighting the recent developments and current challenges in theory, fabrication, and characterization of curvilinear micro-and nanostructures, special attention is paid to perspective research directions entailing new physics and to their strong application potential. Overall, the perspective is aimed at crossing the boundaries between the magnetism and superconductivity communities and drawing attention to the conceptual aspects of how extension of structures into the third dimension and curvilinear geometry can modify existing and aid launching novel functionalities. In addition, the perspective should stimulate the development and dissemination of research and development oriented techniques to facilitate rapid transitions from laboratory demonstrations to industry-...

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Section: Characterizationmentioning

confidence: 99%

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

et al. 2021

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“…If a material is magnetic, Rashba SOC leads to a chiral or extrinsic Dzyaloshinskii-Moriya interaction (DMI) and magnetic anisotropy [34][35][36][37][38][39][40], and it is the curvature-controlled rotation of the spin orientation axis that is the source of non-relativistic spin-orbit effects in magnets [4,5,16]. Curvature-induced DMI can cause the appearance of chiral and topological spin textures of the effective magnetization in toroidal nanomagnets [41,42], bent nanotubes [43,44], curved surfaces [45], nanohelices [46,47] and spherical shells [40,48,49].…”

Section: Introductionmentioning

confidence: 99%

Non-constant geometric curvature for tailored spin–orbit coupling and chirality in superconductor-magnet heterostructures

Johan Skarpeid,

Hugdal,

Salamone

et al. 2024

J. Phys.: Condens. Matter

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We show that tailoring the geometric curvature profile of magnets can be used for bespoke designof an effective non-relativistic spin-orbit coupling, which may be used to control proximity effects ifthe magnet is coupled to a superconductor. We consider proximity-coupled one-dimensional magneticwires with variable curvatures, specifically three distinct shapes classified as J-, C-, and S-type. Wedemonstrate a chirality-dependent spin polarization of the superconducting correlations, and showthe role of curvature in determining the ground state of mixed-chirality junctions. We speculate onhow this may be implemented in novel device design, and include analysis of its usage in a spin-tripletSQUID.

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“…Micromagnetic studies show that geometric curvature in magnetic materials induces two main effects, an anisotropy term and a chiral or extrinsic Dzyaloshinskii-Moriya interaction (DMI) [13], source of an effective magnetic field [14] and many other peculiar features. The curvature-induced DMI causes, for instance, the appearance of chiral and topological spin textures of the effective magnetization in toroidal nanomagnets [15,16], bent nanotubes [17,18], curved surfaces [19], nanohelices [20,21] and spherical shells [14,22,23].…”

Section: Introductionmentioning

confidence: 99%

Curvature control of the superconducting proximity effect in diffusive ferromagnetic nanowires

Salamone,

Hugdal,

Amundsen

et al. 2021

Preprint

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Coupling a conventional s-wave superconductor to a ferromagnet allows, via the proximity effect, to generate superconducting triplet correlations. This feature can be employed to achieve a superconducting triplet spinvalve effect in superconductor-ferromagnet (SF) hybrid structures, for example by switching the magnetizations of the ferromagnets between parallel and antiparallel configurations in F1SF2 and SF1F2 trilayers, or in SF bilayers with both Rashba and Dresselhaus SOC. It was recently reported that geometric curvature can control the generation of long ranged triplets. We use this property to show that the superconducting critical temperature of an SF hybrid nanowire can be tuned by varying the curvature of the ferromagnetic side alone, with no need of another ferromagnet or SOC. We show that the variation of the critical temperature as a function of the curvature can be exploited to obtain a robust, curvature-controlled, superconducting triplet spin-valve effect. Furthermore, we perform an analysis with the inclusion of spin-orbit coupling and explain how it modifies the spin-valve effect both quantitatively and qualitatively.

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Magnetic ground states for bent nanotubes

Cited by 13 publications

References 43 publications

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

Non-constant geometric curvature for tailored spin–orbit coupling and chirality in superconductor-magnet heterostructures

Curvature control of the superconducting proximity effect in diffusive ferromagnetic nanowires

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