Controlling the Magnetic properties of CoPd/Mg Thin Films by Hydrogen

Dhanarajagopal Alltrin^1*, Wen Chin Lin¹

¹Physics, National Taiwan Normal University, Taipei, Taiwan

* Presenter:Dhanarajagopal Alltrin, email:alltrin.chim99@gmail.com

Hydrogen-based materials are crucial for future devices application due to the impact of protecting the environment. Mg-based alloys are attractive for hydrogen storage because of their faster absorption and desorption kinetics. In this research, CoPd/Mg thin films had deposited using the electron beam evaporation method. The films with various thicknesses and different compositions of CoPd alloys had made to study hydrogen-controlled magnetism. Magneto-Optical Kerr Effect has been used to measure the magnetic properties of thin films, and the magnetic hysteresis loops had observed at room temperature, vacuum, and hydrogen environment. The changes on the resultant hysteresis loop had noticed in a vacuum, and the hydrogen environment showed the hydrogen effect on the magnetic properties of the thin films. By Atomic Force Microscope surface of the thin films is monitored before and after the hydrogen effect. X-ray photoelectron spectroscopy showed the difference in the composition of CoPd/Mg between the before and after hydrogen effect.

Keywords: CoPd Alloy, Hydrogen Storage , MgH2, Magnetism, Hysteresis loop