We report the discovery of a field driven transition from a striped to woven
Spin Density Wave (SDW) in the tetragonal heavy fermion compound CeAuSb2​.
Polarized along c, the sinusoidal SDW amplitude is 1.8(2) μB​/Ce for
T≪TN​=6.25(10) K with wavevector q1​=(η,η,21​) (η=0.136(2)). For H∥c, harmonics appearing at
2q1​ evidence a striped magnetic texture below μ∘​Hc1​=2.78(1) T. Above Hc1​, these are replaced by woven harmonics at
q1​+q2​=(2η,0,0)+c∗ until μ∘​Hc2​=5.42(5) T, where satellites vanish and magnetization non-linearly
approaches saturation at 1.64(2) μB​/Ce for μ∘​H≈7 T.Comment: 5 pages, 4 figure