The surface morphology of iron thin films galvanostatically electrodeposited in magnetic fields (0.5 T) was observed by atomic force microscopy (AFM). When the magnetic field was superimposed vertically to the copper substrate plane, iron crystal grains became roundish and uniform by the microscopic magnetohydrodynamic convection generated around the grains. In the magnetic field parallel to the substrate, the grains became undulative by the macroscopic magnetohydrodynamic convection generated in a parallel direction to the cathode surface. (C) 2004 The Electrochemical Society.