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Direct imaging of magnetic field-driven transitions of skyrmion cluster states in FeGe nanodisks.


ABSTRACT: Magnetic skyrmion is a nanosized magnetic whirl with nontrivial topology, which is highly relevant for applications on future memory devices. To enable the applications, theoretical efforts have been made to understand the dynamics of individual skyrmions in magnetic nanostructures. However, directly imaging the evolution of highly geometrically confined individual skyrmions is challenging. Here, we report the magnetic field-driven dynamics of individual skyrmions in FeGe nanodisks with diameters on the order of several skyrmion sizes by using Lorentz transmission electron microscopy. In contrast to the conventional skyrmion lattice in bulk, a series of skyrmion cluster states with different geometrical configurations and the field-driven cascading phase transitions are identified at temperatures far below the magnetic transition temperature. Furthermore, a dynamics, namely the intermittent jumps between the neighboring skyrmion cluster states, is found at elevated temperatures, at which the thermal energy competes with the energy barrier between the skyrmion cluster states.

SUBMITTER: Zhao X 

PROVIDER: S-EPMC4983818 | biostudies-other | 2016 May

REPOSITORIES: biostudies-other

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Direct imaging of magnetic field-driven transitions of skyrmion cluster states in FeGe nanodisks.

Zhao Xuebing X   Jin Chiming C   Wang Chao C   Du Haifeng H   Zang Jiadong J   Tian Mingliang M   Che Renchao R   Zhang Yuheng Y  

Proceedings of the National Academy of Sciences of the United States of America 20160405 18


Magnetic skyrmion is a nanosized magnetic whirl with nontrivial topology, which is highly relevant for applications on future memory devices. To enable the applications, theoretical efforts have been made to understand the dynamics of individual skyrmions in magnetic nanostructures. However, directly imaging the evolution of highly geometrically confined individual skyrmions is challenging. Here, we report the magnetic field-driven dynamics of individual skyrmions in FeGe nanodisks with diameter  ...[more]

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