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@ARTICLE{Pierobon:888820,
author = {Pierobon, Leonardo and Kovács, András and Schäublin,
Robin E. and Gerstl, Stephan S. A. and Caron, Jan and Wyss,
Urs V. and Dunin-Borkowski, Rafal E. and Löffler, Jörg F.
and Charilaou, Michalis},
title = {{U}nconventional magnetization textures and domain-wall
pinning in {S}m–{C}o magnets},
journal = {Scientific reports},
volume = {10},
number = {1},
issn = {2045-2322},
address = {[London]},
publisher = {Macmillan Publishers Limited, part of Springer Nature},
reportid = {FZJ-2020-05234},
pages = {21209},
year = {2020},
note = {ist Open Access},
abstract = {Some of the best-performing high-temperature magnets are
Sm–Co-based alloys with a microstructure that comprises an
Sm2Co17 matrix and magnetically hard SmCo5 cell walls. This
generates a dense domain-wall-pinning network that endows
the material with remarkable magnetic hardness. A precise
understanding of the coupling between magnetism and
microstructure is essential for enhancing the performance of
Sm–Co magnets, but experiments and theory have not yet
converged to a unified model. Here, transmission electron
microscopy, atom probe tomography, and nanometer-resolution
off-axis electron holography have been combined with
micromagnetic simulations to reveal that the magnetization
state in Sm–Co magnets results from curling instabilities
and domain-wall pinning effects at the intersections of
phases with different magnetic hardness. Additionally, this
study has found that topologically non-trivial magnetic
domains separated by a complex network of domain walls play
a key role in the magnetic state by acting as nucleation
sites for magnetization reversal. These findings reveal
previously hidden aspects of magnetism in Sm–Co magnets
and, by identifying weak points in the microstructure,
provide guidelines for improving these high-performance
magnetic materials.},
cin = {ER-C-1},
ddc = {600},
cid = {I:(DE-Juel1)ER-C-1-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)
/ 3D MAGiC - Three-dimensional magnetization textures:
Discovery and control on the nanoscale (856538) / ESTEEM3 -
Enabling Science and Technology through European Electron
Microscopy (823717) / DFG project 405553726 - TRR 270:
Hysterese-Design magnetischer Materialien für effiziente
Energieumwandlung (405553726)},
pid = {G:(DE-HGF)POF3-143 / G:(EU-Grant)856538 /
G:(EU-Grant)823717 / G:(GEPRIS)405553726},
typ = {PUB:(DE-HGF)16},
pubmed = {33273594},
UT = {WOS:000615394300209},
doi = {10.1038/s41598-020-78010-0},
url = {https://juser.fz-juelich.de/record/888820},
}