Abstract
The results of magnetic resonance and magnetization measurements of Fe-implanted strontium titanate (SrTiO 3) are presented. Electron paramagnetic resonance (EPR) spectra including resonance lines due to the paramagnetic Fe 3+–V o site with axially disturbed ligand field, and due to S -state Fe 3+ ions ( S = 5 / 2 and L = 0 ) substituted into the titanium site coordinated by six oxygen atoms in the Ti 4+-centered unit cell, were observed. It has been revealed that the implantation of Fe ions into SrTiO 3 produces a remarkable ferromagnetic behavior. The ferromagnetic resonance (FMR) and magnetization measurements revealed an out-of-plane uniaxial magnetic anisotropy in Fe-implanted SrTiO 3. The observed phenomena are discussed on the basis of strong magnetic dipolar interaction between Fe nanoparticles due to the decreasing interparticle distance with increasing implantation fluence.
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