Tailoring of magnetic properties of MnAl thin films by protons irradiation

We present the study of the MnAl alloy thin films on Si and GaAs substrates irradiated by protons beam. Thin films of MnAl alloy were prepared by electron beam evaporation technique using MnAl alloy as target source. These as deposited thin films were irradiated by 250 keV H+ ions in order to stabilize the τ - phase. MnAl thin film on Si substrate becomes ferromagnetic after irradiating at fluence 5 × 1016 ions/cm2. The XRD spectra of MnAl thin films show T-phase (100) and (111) peaks after irradiation. Magnetic hysteresis loops were measured at 300 K. The effects of 250 keV H+ ion irradiation on structural and magnetic properties of MnAl thin films are reported in this paper.