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Open Access Publications from the University of California

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain.

  • Author(s): Chen, Gong;
  • N'Diaye, Alpha T;
  • Kang, Sang Pyo;
  • Kwon, Hee Young;
  • Won, Changyeon;
  • Wu, Yizheng;
  • Qiu, ZQ;
  • Schmid, Andreas K
  • et al.

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Chiral magnetic domain walls are of great interest because lifting the energetic degeneracy of left- and right-handed spin textures in magnetic domain walls enables fast current-driven domain wall propagation. Although two types of magnetic domain walls are known to exist in magnetic thin films, Bloch- and Néel-walls, up to now the stabilization of homochirality was restricted to Néel-type domain walls. Since the driving mechanism of thin-film magnetic chirality, the interfacial Dzyaloshinskii-Moriya interaction, is thought to vanish in Bloch-type walls, homochiral Bloch walls have remained elusive. Here we use real-space imaging of the spin texture in iron/nickel bilayers on tungsten to show that chiral domain walls of mixed Bloch-type and Néel-type can indeed be stabilized by adding uniaxial strain in the presence of interfacial Dzyaloshinskii-Moriya interaction. Our findings introduce Bloch-type chirality as a new spin texture, which may open up new opportunities to design spin-orbitronics devices.

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