Tailoring the Magnetic Properties of CoFeZrTa Using High Energy Ions in a Dense Plasma Focus Device

Controlling the magnetic properties of materials is important for applications like magnetization switching, spin torque oscillators etc. Introduction of defects into materials has been demonstrated to change properties like damping and spin to charge conversion [1], [2]. Defect engineering in materials can be achieved by exposing to magnetic materials to high energy plasma. In the present study, 100 nm CoFeTaZr thin film was exposed to different shots of a large-volume slow-focus-mode dense plasma focus device to induce defects and modulate the magnetic properties like damping, anisotropy. The plasma temperature and density were studied using a faraday cup to tune the penetration depth of the ions in the magnetic material. The ferromagnetic resonance spectra of the samples with different ion doses were studied using impedance measurements in the frequency range of 1.6 GHz to 2.50 GHz. It was seen that the Gilberts damping factor, effective magnetization and anisotropic magnetization could be modulated with implantation using dense plasma focus.