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We demonstrate a canted magnetization of biatomic zigzag Co chains grown onthe 5 x 1 reconstructed Ir(001) surface using density functional theorycalculations and spin-polarized scanning tunneling microscopy (SP-STM)experiments. Biatomic Co chains grow in three different structuralconfigurations and are all in a ferromagnetic state. Two chain types possesshigh symmetry due to two equivalent atomic strands and an easy magnetizationdirection which is along one of the principal crystallographic axes. The easymagnetization axis of the zigzag Co chains is canted away from the surfacenormal by an angle of 33 degrees. This giant effect is caused by the brokenchain symmetry on the substrate in combination with the strong spin-orbitcoupling of Ir. SP-STM measurements confirm stable ferromagnetic order of thezigzag chains with a canted magnetization.

Giant magnetization canting due to symmetry breaking in zigzag Co chains on Ir(001)