Experimental observation of chiral magnetic bobbers in B20-type FeGe View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-04-09

AUTHORS

Fengshan Zheng, Filipp N. Rybakov, Aleksandr B. Borisov, Dongsheng Song, Shasha Wang, Zi-An Li, Haifeng Du, Nikolai S. Kiselev, Jan Caron, András Kovács, Mingliang Tian, Yuheng Zhang, Stefan Blügel, Rafal E. Dunin-Borkowski

ABSTRACT

Chiral magnetic skyrmions1,2 are nanoscale vortex-like spin textures that form in the presence of an applied magnetic field in ferromagnets that support the Dzyaloshinskii–Moriya interaction (DMI) because of strong spin–orbit coupling and broken inversion symmetry of the crystal3,4. In sharp contrast to other systems5,6 that allow for the formation of a variety of two-dimensional (2D) skyrmions, in chiral magnets the presence of the DMI commonly prevents the stability and coexistence of topological excitations of different types7. Recently, a new type of localized particle-like object—the chiral bobber (ChB)—was predicted theoretically in such materials8. However, its existence has not yet been verified experimentally. Here, we report the direct observation of ChBs in thin films of B20-type FeGe by means of quantitative off-axis electron holography (EH). We identify the part of the temperature–magnetic field phase diagram in which ChBs exist and distinguish two mechanisms for their nucleation. Furthermore, we show that ChBs are able to coexist with skyrmions over a wide range of parameters, which suggests their possible practical applications in novel magnetic solid-state memory devices, in which a stream of binary data bits can be encoded by a sequence of skyrmions and bobbers. More... »

PAGES

451-455

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41565-018-0093-3

DOI

http://dx.doi.org/10.1038/s41565-018-0093-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1103190183

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29632400


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19 schema:description Chiral magnetic skyrmions1,2 are nanoscale vortex-like spin textures that form in the presence of an applied magnetic field in ferromagnets that support the Dzyaloshinskii–Moriya interaction (DMI) because of strong spin–orbit coupling and broken inversion symmetry of the crystal3,4. In sharp contrast to other systems5,6 that allow for the formation of a variety of two-dimensional (2D) skyrmions, in chiral magnets the presence of the DMI commonly prevents the stability and coexistence of topological excitations of different types7. Recently, a new type of localized particle-like object—the chiral bobber (ChB)—was predicted theoretically in such materials8. However, its existence has not yet been verified experimentally. Here, we report the direct observation of ChBs in thin films of B20-type FeGe by means of quantitative off-axis electron holography (EH). We identify the part of the temperature–magnetic field phase diagram in which ChBs exist and distinguish two mechanisms for their nucleation. Furthermore, we show that ChBs are able to coexist with skyrmions over a wide range of parameters, which suggests their possible practical applications in novel magnetic solid-state memory devices, in which a stream of binary data bits can be encoded by a sequence of skyrmions and bobbers.
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25 schema:keywords CHB
26 Dzyaloshinskii-Moriya interaction
27 FeGe
28 applications
29 applied magnetic field
30 axis electron holography
31 binary data bits
32 bits
33 bobbers
34 chiral bobbers
35 chiral magnets
36 coexistence
37 contrast
38 coupling
39 data bits
40 devices
41 diagram
42 direct observation
43 electron holography
44 excitation
45 existence
46 experimental observations
47 ferromagnet
48 field
49 field phase diagram
50 films
51 formation
52 holography
53 interaction
54 inversion symmetry
55 magnetic field
56 magnets
57 means
58 mechanism
59 memory devices
60 new type
61 nucleation
62 objects
63 observations
64 parameters
65 part
66 particle-like objects
67 phase diagram
68 possible practical applications
69 practical applications
70 presence
71 range
72 sequence
73 sharp contrast
74 skyrmions
75 solid-state memory devices
76 spin textures
77 spin-orbit coupling
78 stability
79 streams
80 strong spin-orbit coupling
81 symmetry
82 temperature-magnetic field phase diagram
83 texture
84 thin films
85 topological excitations
86 two-dimensional skyrmions
87 types
88 variety
89 vortex-like spin textures
90 wide range
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