Extended Data Fig. 4: Step-like anisotropic magnetoresistance due to switching of p-wave domains, corresponding to switching the spin polarisation vector α.
a-c, Three types of α-domain configurations that can be controlled by rotating the magnetic field in the ab-plane. The relative angle between the a-axis and B is ϕ. The gray shaded wedges indicate the range of angles where a given domain is stable: ϕ = 0° ~ 60° (180° ~ 240°), 60° ~ 120° (240° ~ 300°), and 120° ~ 180° (300° ~ 360°), respectively, for Configuration 1, 2, and 3. d, Polar plot of AMR with illustrations of α-domain configurations. Step-like AMR observed in the p-wave phase originating from the switching of α-domains (see Supplementary Fig. 9). For current Ia∥a, a higher resistance \({R}_{xx}^{a}\) appears in Configuration 2 (red region), where I is nearly parallel to α. We also show the measurement configuration of anisotropic magnetoresistance (AMR). The current Ia is applied along the a-axis, while the magnetic field B is rotated within the ab-plane. e,f, AMR of a fabricated device with strain relief at T = 2 K and 30 K. The second y-axis on the right-hand side shows the relative magnitude of the AMR. g,h, AMR of a bulk sample at T = 2 K and 30 K. Bulk and device curves are in good qualitative agreement, although the AMR’s relative magnitude is three times larger in the suspended device. We note that the AMR measurement on devices allows us to measure the resistivity along several current directions simultaneously (see Fig. 3, Main Text). i,j, Separation of AMR into (i) step-type anomaly related to resistivity anisotropy in the p-wave magnet (green line, right axis) and (ii) six-fold patterns with the periodicity of the underlying crystal lattice (blue symbols, left axis). As the relative magnitude of the p-wave AMR is larger in the device, the six-fold patterns are harder to distinguish. Arrows in e,g indicate the sweep direction of the magnetic-field angle ϕ.
