Evolution of morphology in electrodeposited nanocrystalline Co-Ni films by in-situ high magnetic field application

► High magnetic field induced morphological transition in electrodeposited CoNi. ► Short-clavated grain shape changing into nanosheets. ► Grain size and roughness increased to reach a maximum value at 9 T field. ► 12 T field resulting in minimum grain size and roughness. ► The overlap effects of Lorentz force and paramagnetic force on mass transport.