Magnetic twisting in an artificial ferrimagnet: Anisotropic magnetoresistance on Py/Gd/Py/Gd/Py/Si Nx multilayers

The intensive study of noncollinear magnets promotes an urgent demand for the quantitative characterization of the noncollinear magnetic structures, which host numerous exotic phenomena. Here we systematically study the noncollinear magnetic structure of an artificial ferrimagnetic multilayer. The anisotropic magnetoresistance (AMR) measurements reveal two distinct twisted states whose magnetic structures can be quantitatively characterized with the assistance of micromagnetic simulations. Our results manifest AMR as an ideal probe of the noncollinear magnetic structure in artificial ferrimagnets.