1. Magnetostatics in 3D – O. Fruchart (SPINTEC Grenoble), Anthony Arrott (emeritus, or
André Thiaville, LPS Paris)
o Basics of magnetostatics
▪ Basics: Maxwell and the various ways to handle
▪ Demag coefficients and their generality & validity
▪ Length scales
o Role in determining/ stabilising 3D textures:
▪ Importance of magneto-statics, facing in practice challenges in
simulation/modeling to take them into account
▪ Single-domain, near-single-domains, flux closure patterns described in general
terms.
▪ Magnetostatics versus chirality
o Range of dipolar fields
▪ Concepts, misconceptions, examples, dipoles and multipoles
▪ Coding information in 3D
2. Spin textures & topological textures in 3D – Claire Donnelly (MPI Dresden), Paul Sutcliff
(Durham University), Attila Kakay (HZDR Dresden)
o Accessible introduction to 3D textures, topology, chirality, curvature.
o 3D spin textures in the bulk
▪ 2D→ 3D structure in the bulk, skyrmions and skyrmions tubes & transformations
▪ Hopfions: what are they, predictions
▪ Magnetic vortex rings, vortices in 3D
▪ Bloch points.
▪ Bring together concepts and experimental realisations, lightly describe assets for
functions and applications
o 3D spin textures in confined geometries
▪ Flux-closure patterns in compact objects
▪ Wires (micro and nano) and rods
▪ Shells: spheres, tubes, core-shell
▪ 3D architectures and superlattices, 3D frustrated systems
o Spintronics and dynamics of spin textures ▪ DW dynamics
▪ Spin waves
▪ Magnonic crystals
Methodologies
NB: writing driven by objectives for achievements, capacities of each technique to address
them, frontiers and prospects
3. Synthesis, focusing on functions of the resulting materials – Amalio Fernandez Pacheco
(Zaragoza), Rui Xu (HZDR Dresden), Bethanie Stadler (Univ. Minnesota, USA), Oliver
Gutfleisch (TU Darmstadt) or Dieter Suess (Univ Vienna)
o Broad overview of synthesis routes (non-exhaustive list below)
▪ Top-down
• 3D direct nanoprinting: FEBID
• Additive manufacturing @micrometer/mm length scales (see also dedicated
chapter)
▪ Scaffolds + synthesis
• Templates: 2-photon litho, anodized alumina, polycarbonate foils and their
engineering
• Capping / filling techniques: electroplating, ALD, electroless…
▪ Self-construction :origami, rolling etc.
o Discussion should be driven by the properties sought or obtained, of importance for
magnetic and spintronic materials: magnetization, exchange, symmetry,
microstructure, roughness, resistivity, magnetic damping etc.
4. 3D magnetic characterization – Daniel Wolf or Axel Lubk (IFW Dresden), Claire Donnelly
(MPI Dresden), Charudatta M. Phatak (Argonne, USA), Olivier Fruchart (SPINTEC
Grenoble), Ingo Manke.
o Driven by questions and capacities to answer them, not an exhaustive review of all
techniques. Criteria: what is probed, sensitivity, spatial resolution, combine structure
and magnetism, elemental sensitivity, time resolution, 2D/3D.
o Yet, mention those:
▪ Pseudo-2D: XMCD projections (shadow-PEEM, (S)TXM), lens-less including
ptychography, electron holography, neutron bulk imaging, scanning near-field
microscopies (NV center, Magnetic force microscopy, Hall probe etc.).
▪ 3D imaging and reconstruction: methodology (lamino, tomo…), techniques,
reconstruction algorithms, limitations/ challenges.
o Entanglement of microscopy/topography and numerical simulations
o What can be observed/ probed, rather than how?
o Combine with how to interpret, and pitfalls to watch out for? E.g. XMCD tomo: limit
on imaging divergent structures.
5. Numerical micromagnetics – Richard Evans(Univ York), Dieter Suess(Univ Vienna), Attila
Kakay (HZDR Dresden), Daria Gusakova (SPINTEC Grenoble), V. Lomakin (San Diego)
o Basics of the micromagnetics theory
o Numerical implementations. Discuss efficiency and reliability.
o Multiscale, atomistic, LLB etc.
o Display, analysis and topological understanding of 3D magnetization textures (for the
physicists). Examples: visualization toolkit (surface and open views, cuts and
unrolling, iso lines and surface, color maps with artefacts for the human eye…),
processing (calculation of topological numbers, vorticity, charges etc.).
o Display, analysis and topological understanding (for the physicists)
o Entanglement of microscopy/tomography and numerical simulations: numerical
triples (rather than twins): make the most of advanced instruments to extract most
information from experimental data; make the most of simulations to compare with
reality.
eBook Project Approval Meeting title information sheet v3.5
Functions and applications
NB: writing driven by functions, potential use, challenges and work ahead
6. Magnetic storage and computing in 3D – L. Prejbeanu, K. Garello (SPINTEC, Grenoble),
Hideo Ohno or Kyota Watanabe (Tohoku)
o Short review of 2D technologies, highlight limitations
o 3D stacks, torques and spin textures
o PSA-MRAM, 3-terminal SOT-MRAM (?). Address: “3D Racetrack, where are we?”
Technological details on how realistic it is, e.g. current densities…
o 3D architectures for artificial intelligence (??)
7. 3D MEMS, magnetic sensors, actuators and other devices –Johannes Paul (Sensitech
GmbH, backup Claire Baraduc SPINTEC Grenoble), Orphé Cugat (G2Elab – Grenoble),
Johan Paulides (Advanced electromagnetics, The Netherlands)
o Sensing 3D magnetic fields
o Magnetic MEMS and NEMS (incl. FEBID actuators, see Paolo Vavassori)
o 3D magnetic architectures for production of 3D magnetic fields, energy production/
harvesting/ magnetocalorics
8. 3D magnetic nanorobotics – Bradley Nelson (ETH Zürich), Jizhai Cui (Univ. Fudan, China),
Robert Streubel (Univ. Nebraska)
o Swimmers – Bradley Nelson
o 3D “Origami”, bio and reconfigurable devices – Jizhai Cui
o Magnetic fluids etc. – Robert Streubel, T Russell https://www.mdpi.com/1996-
1944/13/12/2712