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<p>Fe<sub>3</sub>Pt/Pt films prepared using DC sputtering were annealed at 600&#xa0;°C to structurally transform them to L1<sub>0</sub> ordered FePt phase. The structural and magnetic phase transformation of FePt films were quantitatively investigated with the variation in the thickness of Ag under-layered tri-layered structure Ag/Fe<sub>3</sub>Pt/Pt. Structural studies revealed increase in order parameter with enhanced (001) orientation of L1<sub>0</sub> FePt thin films with increasing Ag film thickness. X-ray diffraction profile fitting was performed to extract the content of Ag and FePt with A1 and L1<sub>0</sub> phases present in the Ag/Fe<sub>3</sub>Pt/Pt films. Profile fitting indicates a 99% phase transformation with an Ag underlayer thickness of 84&#xa0;nm. Magnetic measurements showed lowest thickness of Ag results in the lowering of coercivity while for higher thickness, enhancement in coercivity was observed. Optimal Ag thickness was observed at 84&#xa0;nm, yielding a coercivity increase in FePt thin films up to 15.7 kOe. Monte Carlo Simulation of hysteresis curves discovered that the lower thickness of Ag provides inadequate driving force for A1 to L1<sub>0</sub> phase transformation. These findings underline the critical role of Ag underlayer thickness in tuning the magnetic properties of FePt thin films. Surface morphology revealed similar grain sized FePt nanoparticles with and without Ag underlayer.</p>

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Optimizing Fe3Pt/Pt Thin Films with Ag Additives: Structural and Magnetic Analysis

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Rekha Gupta,
  • Rajan Goyal,
  • Rohit Medwal,
  • S. Annapoorni

摘要

Fe3Pt/Pt films prepared using DC sputtering were annealed at 600 °C to structurally transform them to L10 ordered FePt phase. The structural and magnetic phase transformation of FePt films were quantitatively investigated with the variation in the thickness of Ag under-layered tri-layered structure Ag/Fe3Pt/Pt. Structural studies revealed increase in order parameter with enhanced (001) orientation of L10 FePt thin films with increasing Ag film thickness. X-ray diffraction profile fitting was performed to extract the content of Ag and FePt with A1 and L10 phases present in the Ag/Fe3Pt/Pt films. Profile fitting indicates a 99% phase transformation with an Ag underlayer thickness of 84 nm. Magnetic measurements showed lowest thickness of Ag results in the lowering of coercivity while for higher thickness, enhancement in coercivity was observed. Optimal Ag thickness was observed at 84 nm, yielding a coercivity increase in FePt thin films up to 15.7 kOe. Monte Carlo Simulation of hysteresis curves discovered that the lower thickness of Ag provides inadequate driving force for A1 to L10 phase transformation. These findings underline the critical role of Ag underlayer thickness in tuning the magnetic properties of FePt thin films. Surface morphology revealed similar grain sized FePt nanoparticles with and without Ag underlayer.