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Magnetostatic twists in room-temperature skyrmions explored by nitrogen-vacancy
center spin texture reconstruction
#MMPMID30006532
Dovzhenko Y
; Casola F
; Schlotter S
; Zhou TX
; Büttner F
; Walsworth RL
; Beach GSD
; Yacoby A
Nat Commun
2018[Jul]; 9
(1
): 2712
PMID30006532
show ga
Magnetic skyrmions are two-dimensional non-collinear spin textures characterized
by an integer topological number. Room-temperature skyrmions were recently found
in magnetic multilayer stacks, where their stability was largely attributed to
the interfacial Dzyaloshinskii-Moriya interaction. The strength of this
interaction and its role in stabilizing the skyrmions is not yet well understood,
and imaging of the full spin structure is needed to address this question. Here,
we use a nitrogen-vacancy centre in diamond to measure a map of magnetic fields
produced by a skyrmion in a magnetic multilayer under ambient conditions. We
compute the manifold of candidate spin structures and select the physically
meaningful solution. We find a Néel-type skyrmion whose chirality is not
left-handed, contrary to preceding reports. We propose skyrmion tube-like
structures whose chirality rotates through the film thickness. We show that NV
magnetometry, combined with our analysis method, provides a unique tool to
investigate this previously inaccessible phenomenon.