We report a magnetic state in GaV₄Se₈ which emerges exclusively in samples with mesoscale polar domains and not in polar mono-domain crystals. It is manifested by a sharp anomaly in the magnetic susceptibility and the magnetic torque, distinct from other anomalies observed also in polar mono-domain samples upon transitions between the cycloidal, the Néel-type skyrmion lattice and the ferromagnetic states. We ascribe this additional transition to the transformation of distinct magnetic textures, confined to polar domain walls (DW), to the ferromagnetic (FM) state. The emergence of these DW-confined magnetic states is likely driven by the mismatch of different spin spirals, hosted by the adjacent domains. A clear anomaly in the magneto-current indicates that the DW-confined magnetic states also have strong contributions to the magnetoelectric response. We expect polar DWs to commonly host such confined magnetic edge states and, thus, offer a fertile ground to explore novel forms of magnetism.

我们报告了GaV ₄ Se _8中的磁态它仅出现在具有中尺度极性域的样品中，而不出现在极性单域晶体中。它的特征是磁化率和磁转矩出现了明显的异常，这与在摆线，Néel型Skyrmion晶格和铁磁态之间跃迁时在极性单畴样品中也观察到的其他异常不同。我们将这种额外的过渡归因于独特的磁织构（仅限于磁畴壁（DW））到铁磁（FM）状态的转变。这些由DW限制的磁态的出现可能是由相邻域所控制的不同自旋螺旋的不匹配所驱动的。磁电流的明显异常表明，DW限制的磁态对磁电响应也有很强的贡献。