Fig. 3
From: Non-collinear spin states in bottom-up fabricated atomic chains
Non-collinear spin state in the Fe4 chain with dNN = 3a. a SPSTM topograph of the Fe4 chain measured at Bz = 3 T (Vs = −6 mV, Istab = 0.5 nA). The white scale bar has a length of 1 nm. b Calculated spin-expectation values at Bz = 3 T from ED for each atom in the Fe4 chain, using the parameters given in Table 1, and JNN = −60 μeV, D⊥,NN = −50 μeV, JNNN = +15 μeV, and D⊥,NNN = −20 μeV. c, d ISTS spectra taken with a magnetic tip (SP-ISTS, c) and corresponding colorplots (d) measured on all four atoms in the Fe4 chain in a magnetic field up to Bz = 7 T. (Vstab = −6 mV, Istab = 3 nA, Vmod = 40 μV). e Calculated ISTS from the perturbation theory model using the same parameters as in (b)
