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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Optimizing Perpendicular Magnetic Anisotropy in MgO/CoFeB Structures Through Ultrathin CoFeB-Enhanced Ta Capping

Yu-Shen Yen1,2, Chun-Liang Yang2, Yung-Ling Chang2

  • 1Ph.D. Program in Prospective Functional Materials Industry, National Tsing Hua University, Hsinchu 30013, Taiwan.

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Summary

This study optimizes perpendicular magnetic anisotropy (PMA) in CoFeB/MgO by adding an ultrathin CoFeB layer. This insertion enhances PMA and thermal stability, crucial for advanced spintronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Perpendicular magnetic anisotropy (PMA) is critical for high-density magnetic storage devices.
  • Optimizing the CoFeB/MgO interface is key to enhancing PMA performance and thermal stability.
  • Interfacial diffusion and oxidation control are significant challenges in fabricating robust magnetic heterostructures.

Purpose of the Study:

  • To investigate the effect of an ultrathin CoFeB insertion layer on PMA in CoFeB/MgO structures.
  • To enhance the interfacial magnetic anisotropy and thermal stability of CoFeB/MgO stacks.
  • To provide a scalable method for improving PMA compatible with semiconductor manufacturing.

Main Methods:

  • Fabrication of CoFeB/MgO stacks with a strategic ultrathin CoFeB insertion layer (0.43 nm) between the CoFeB/MgO and the top capping layer (Ta or Mo).
  • Postannealing treatment at 400 °C to optimize interfacial properties.
  • Characterization using high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS) to analyze structural and chemical properties.

Main Results:

  • The insertion of a 0.43 nm CoFeB layer significantly boosted PMA, achieving an interfacial anisotropy constant (K) of 3.8 erg/cm².
  • The CoFeB insertion layer effectively suppressed interfacial diffusion from the Ta or Mo capping layer.
  • Improved Fe-O hybridization and stabilized MgO crystallinity were observed, leading to enhanced interfacial integrity.

Conclusions:

  • The ultrathin CoFeB insertion layer is a highly effective strategy for enhancing PMA and thermal stability in CoFeB/MgO structures.
  • This approach offers a promising solution for next-generation spintronic devices, compatible with CMOS back-end-of-line processing.
  • Interfacial engineering through strategic layer insertion is crucial for advancing spintronic technology performance.