Structural and Magnetic Properties of Ni-Implanted Rutile Single Crystals

The structural and magnetic properties of Ni-implanted rutile single crystals are discussed. Ni nanocrystals (NCs) are formed in TiO₂ after ion implantation. Their crystalline sizes increase with increasing post−annealing temperature. Metallic Ni nanocrystals inside the TiO₂ matrix are stable up to an annealing temperature of 1073 K. The Ni NCs formed inside TiO₂ are the major contribution to the measured ferromagnetism.