Magnetic Properties of Heavy Ion Implanted Monocrystalline ZnO

Magnetization of monocrystalline ZnO samples implanted with magnetic Co and with Ar and Kr noble gases ions, with energies and doses creating comparable damage, was studied as a function of magnetic field (H) at constant temperature in the temperature range between 2 and 300 K and as a function of temperature for H = 1 kOe and 10 kOe. In the Co-implanted ZnO, paramagnetic and some residual ferromagnetic/superparamagnetic phases were revealed, while the Kr- and Ar-implantations do not introduce magnetic centers. The existence of ferromagnetic/superparamagnetic residual phases in the Co-implanted layer was confirmed in the measurements of zero-field cooled/field cooled magnetization at H = 10, 50, and 500 Oe and gave a rise to hysteresis loop appearing in the low temperature range from 2 to 15 K.

Automated summary

The magnetization of monocrystalline ZnO samples implanted with magnetic Co and with Ar and Kr noble gases ions was investigated. It was found that Co-implanted ZnO samples showed paramagnetic and residual ferromagnetic/superparamagnetic phases, while the implants of Ar and Kr did not introduce magnetic centers.