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2015 ; 112
(46
): 14212-7
Nephropedia Template TP
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English Wikipedia
Filming the formation and fluctuation of skyrmion domains by cryo-Lorentz
transmission electron microscopy
#MMPMID26578765
Rajeswari J
; Huang P
; Mancini GF
; Murooka Y
; Latychevskaia T
; McGrouther D
; Cantoni M
; Baldini E
; White JS
; Magrez A
; Giamarchi T
; Rønnow HM
; Carbone F
Proc Natl Acad Sci U S A
2015[Nov]; 112
(46
): 14212-7
PMID26578765
show ga
Magnetic skyrmions are promising candidates as information carriers in logic or
storage devices thanks to their robustness, guaranteed by the topological
protection, and their nanometric size. Currently, little is known about the
influence of parameters such as disorder, defects, or external stimuli on the
long-range spatial distribution and temporal evolution of the skyrmion lattice.
Here, using a large (7.3 × 7.3 ?m(2)) single-crystal nanoslice (150 nm thick) of
Cu2OSeO3, we image up to 70,000 skyrmions by means of cryo-Lorentz transmission
electron microscopy as a function of the applied magnetic field. The emergence of
the skyrmion lattice from the helimagnetic phase is monitored, revealing the
existence of a glassy skyrmion phase at the phase transition field, where patches
of an octagonally distorted skyrmion lattice are also discovered. In the skyrmion
phase, dislocations are shown to cause the emergence and switching between
domains with different lattice orientations, and the temporal fluctuation of
these domains is filmed. These results demonstrate the importance of direct-space
and real-time imaging of skyrmion domains for addressing both their long-range
topology and stability.