Department of Physics and Astronomy: Individual Faculty Pages
David Sellmyer Publications
Accessibility Remediation
If you are unable to use this item in its current form due to accessibility barriers, you may request remediation through our remediation request form.
Document Type
Article
Date of this Version
2013
Citation
IEEE Transactions on Magnetics 49:7 (July 2013)
Abstract
Films of L10-structure Fe50–xCoxPt50 films are synthesized by co-sputtering Fe, Co, and Pt on (001) MgO substrates and Si substrates with in-situ heating at 830°C. The nanostructures and magnetic properties of the films are characterized by X-ray diffraction, transmission electron microscopy, and SQUID. The compositions of the samples Fe50–xCoxPt50 are designed to maintain an atomic (Fe+Co):Pt ratio of 50:50 while increasing the Co content in each successive sample. In all samples, the X-ray diffraction patterns from samples on MgO substrate exhibit three strong peaks, namely L10Fe50–xCoxPt50 (001), (002), and MgO (002). The X-ray and electron diffraction patterns from untextured samples deposited on Si substrates can be indexed using the L10-structure, being consistent with the result of samples on MgO substrate. Hysteresis-loop measurements show that with increase of the Co concentration from 0 to 15 at%, the saturation magnetization Ms increases from 1017 emu/cm3 to 1165 emu/cm3, the coercivity decreases from 30 kOe to 14 kOe, and anisotropy decreases from 67 Merg/cm3 to 46 Merg/cm3. The nominal maximum energy products are in the range of 39–41 MGOe.