TY - JOUR
T1 - Single-spin sensing of domain-wall structure and dynamics in a thin-film skyrmion host
AU - Jenkins, Alec
AU - Pelliccione, Matthew
AU - Yu, Guoqiang
AU - Ma, Xin
AU - Li, Xiaoqin
AU - Wang, Kang L.
AU - Jayich, Ania C.Bleszynski
N1 - Funding Information:
We thank Preeti Ovartchaiyapong for diamond fabrication advice and Simon Meynell and Susanne Baumann for helpful discussions. The work at UCSB was supported by an Air Force Office of Scientific Research PECASE award. A portion of the work was done in the UC Santa Barbara nanofabrication facility, part of the NSF funded NNIN network. The authors acknowledge support from the Nanostructures Cleanroom Facility (NCF) at the California NanoSystems Institute (CNSI). The research reported here made use of shared facilities of the UCSB MRSEC (NSF DMR 1720256), a member of the Materials Research Facilities Network ( http://www.mrfn.org ). K.L.W. acknowledges the support of NSF-1611570. G.Y. acknowledges the financial support from the National Natural Science Foundation of China [NSFC, Grant No. 11874409], the National Natural Science Foundation of China (NSFC)-Science Foundation Ireland (SFI) Partnership Programme [Grant No. 51861135104], and 1000 Youth Talents Program. X.M. acknowledges the support from NSF Grant Nos. CCF 1740352 and SRC nCORE NC-2766-A. The work at UT Austin was primarily supported as part of SHINES, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Science (BES) under Award No. DE-SC0012670.
Funding Information:
We thank Preeti Ovartchaiyapong for diamond fabrication advice and Simon Meynell and Susanne Baumann for helpful discussions. The work at UCSB was supported by an Air Force Office of Scientific Research PECASE award. A portion of the work was done in the UC Santa Barbara nanofabrication facility, part of the NSF funded NNIN network. The authors acknowledge support from the Nanostructures Cleanroom Facility (NCF) at the California NanoSystems Institute (CNSI). The research reported here made use of shared facilities of the UCSB MRSEC (NSF DMR 1720256), a member of the Materials Research Facilities Network (http://www.mrfn.org). K.L.W. acknowledges the support of NSF-1611570. G.Y. acknowledges the financial support from the National Natural Science Foundation of China [NSFC, Grant No. 11874409], the National Natural Science Foundation of China (NSFC)-Science Foundation Ireland (SFI) Partnership Programme [Grant No. 51861135104], and 1000 Youth Talents Program. X.M. acknowledges the support from NSF Grant Nos. CCF 1740352 and SRC nCORE NC-2766-A. The work at UT Austin was primarily supported as part of SHINES, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Science (BES) under Award No. DE-SC0012670.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Skyrmions are nanoscale magnetic structures with features promising for future low-power memory or logic devices. In this work, we demonstrate scanning techniques based on nitrogen vacancy center magnetometry that simultaneously probe both the magnetic dynamics and structure of room temperature skyrmion bubbles in a thin-film system Ta/CoFeB/MgO. We confirm the handedness of the Dzyaloshinskii-Moriya interaction in this material and extract the magnitude of the helicity angle of the skyrmion bubbles. Our measurements also show that the skyrmion bubbles in this material change size in discrete steps, dependent on the local pinning environment, with their average size determined dynamically as their domain walls hop between pinning sites. In addition, an increase in magnetic field noise is observed near skyrmion bubble domain walls. These measurements highlight the importance of interactions between internal degrees of freedom of skyrmion bubble domain walls and pinning sites in thin-film systems. Our observations have relevance for future devices based on skyrmion bubbles where pinning interactions will determine important aspects of current-driven motion.
AB - Skyrmions are nanoscale magnetic structures with features promising for future low-power memory or logic devices. In this work, we demonstrate scanning techniques based on nitrogen vacancy center magnetometry that simultaneously probe both the magnetic dynamics and structure of room temperature skyrmion bubbles in a thin-film system Ta/CoFeB/MgO. We confirm the handedness of the Dzyaloshinskii-Moriya interaction in this material and extract the magnitude of the helicity angle of the skyrmion bubbles. Our measurements also show that the skyrmion bubbles in this material change size in discrete steps, dependent on the local pinning environment, with their average size determined dynamically as their domain walls hop between pinning sites. In addition, an increase in magnetic field noise is observed near skyrmion bubble domain walls. These measurements highlight the importance of interactions between internal degrees of freedom of skyrmion bubble domain walls and pinning sites in thin-film systems. Our observations have relevance for future devices based on skyrmion bubbles where pinning interactions will determine important aspects of current-driven motion.
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U2 - 10.1103/PhysRevMaterials.3.083801
DO - 10.1103/PhysRevMaterials.3.083801
M3 - Article
AN - SCOPUS:85070562176
VL - 3
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 8
M1 - 083801
ER -