Bias-free spin-wave phase shifter for magnonic logic
  A design of a magnonic phase shifter operating without an external bias magnetic field is proposed. The phase shifter uses a localized collective spin wave mode propagating along a domain wall "waveguide" in a dipolarly-coupled magnetic dot array existing in a chessboard antiferromagnetic (CAFM) ground state. It is demonstrated numerically that remagnetization of a single magnetic dot adjacent to the domain wall waveguide introduces a controllable phase shift in the propagating spin wave mode without significant change of the mode amplitude. It is also demonstrated that a logic XOR gate can be realized in the same system. 
Steven Louis, Ivan Lisenkov, Sergey Nikitov, Vasyl Tyberkevych, Andrei   Slavin
cond-mat.mes-hall