Metamagnetic transitions in Y0.5Er0.5Fe2D4.2 deuteride studied by high magnetic field and neutron diffraction experiments

•Two first order type metamagnetic transitions of different physical origin exist.•A forced ferri-ferromagnetic transition is observed above a transition field of 8 T.•An itinerant electron metamagnetic transition is observed above TM0 = 38 K.•Transition field from ferri to antiferromagnetic state increases linearly above TM0.•Er moments parallel to Fe moments are induced under high magnetic field.