Transition to and from the skyrmion lattice phase by electric fields in a magnetoelectric compound.
Transition to and from the skyrmion lattice phase by electric fields in a magnetoelectric compound.
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DOI:
10.1038/ncomms12669
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发表时间:
2016-09-01
影响因子:
16.6
通讯作者:
Tokura, Y.
中科院分区:
文献类型:
--
作者:
Okamura, Y.;Kagawa, F.;Seki, S.;Tokura, Y.
Dissipation-less electric control of magnetic state variable is an important target of contemporary spintronics. The non-volatile control of magnetic skyrmions, nanometre-sized spin-swirling objects, with electric fields may exemplify this goal. The skyrmion-hosting magnetoelectric chiral magnet Cu2OSeO3 provides a unique platform for the implementation of such control; however, the hysteresis that accompanies the first-order transition associated with the skyrmion phase is negligibly narrow in practice. Here we demonstrate another method that functions irrespective of the transition boundary. Combination of magnetic-susceptibility measurements and microwave spectroscopy reveals that although the metastable skyrmion lattice is normally hidden behind a more thermodynamically stable conical phase, it emerges under electric fields and persists down to the lowest temperature. Once created, this metastable skyrmion lattice remains without electric fields, establishing a bistability distinct from the transition hysteresis. This bistability thus enables non-volatile electric-field control of the skyrmion lattice even in temperature/magnetic-field regions far from the transition boundary. Magnetoelectric material Cu2OSeO3 hosts topologically-protected skyrmion magnetization textures, however only in an impractically narrow temperature range. Here, the authors demonstrate how the metastable skyrmion phase may be extended to low temperatures by an applied electric field.
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通讯作者:
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影响因子:
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通讯作者:
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