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Manipulating the helical phase of chiral magnets with electric currents | Jan Masell
; Xiuzhen Z. Yu
; Naoya Kanazawa
; Yoshinori Tokura
; Naoto Nagaosa
; | Date: |
7 Jul 2020 | Abstract: | The competition between the ferromagnetic exchange interaction and
anti-symmetric Dzyaloshinskii-Moriya interaction can stabilize a helical phase
or support the formation of skyrmions. While skyrmions and lattices of such are
widely studied and known to be manipulable by electric currents, the
structurally less complex helical phase is stronger pinned by defects. In thin
films of chiral magnets, however, the current density can be large enough to
unpin the helical phase and reveal its fascinating dynamics. We theoretically
study the dynamics of the helical phase under spin-transfer torques that reveal
distinct orientation processes, driven by topological defects in the bulk or
induced by edges, and instabilities at larger currents. Our experiments confirm
the possibility of on-demand switching the helix orientation by current pulses.
Finally, we propose a novel design for memory devices that exploits the
orientation of the helical phase as new order parameter. | Source: | arXiv, 2007.3414 | Services: | Forum | Review | PDF | Favorites |
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