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Self-assembled monolayers based spintronics: from ferromagnetic surface functionalization to spin-dependent

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  • 1Unité Mixte de Physique CNRS-Thales, 1 Av. A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France. Instituto de Ciencia Molecular (ICMol), Universitat de Valencia, C. Caterdratico Jose Beltran 2, 46980 Paterna, Spain.

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This study demonstrates the functionalization of ferromagnetic La2/3Sr1/3MnO3 surfaces with self-assembled monolayers for spintronics. This molecular engineering enables robust tunnel magnetoresistance in devices, paving the way for new spintronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Chemically functionalized surfaces are crucial for applications in medicine and electronics.
  • Functionalization of magnetic surfaces, particularly for spintronics, remains underexplored.
  • La2/3Sr1/3MnO3 is a key ferromagnetic oxide and a prototypical half-metallic manganite in spintronics.

Purpose of the Study:

  • To functionalize the ferromagnetic oxide La2/3Sr1/3MnO3 with self-assembled monolayers.
  • To integrate these functionalized surfaces into spintronics devices, specifically magnetic tunnel junctions.
  • To investigate the impact of molecular functionalization on device performance and explore molecular engineering in spintronics.

Main Methods:

  • Functionalization of La2/3Sr1/3MnO3 surfaces using alkylphosphonic acid molecules.
  • Fabrication of magnetic tunnel junctions utilizing a nano-indentation based lithography technique.
  • Characterization of tunnel resistance and tunnel magnetoresistance (TMR) as a function of alkyl chain length.

Main Results:

  • Successful functionalization of La2/3Sr1/3MnO3 with alkylphosphonic acid molecules was achieved.
  • An exponential increase in tunnel resistance with increasing alkyl chain length confirmed molecular connection.
  • Stable and robust tunnel magnetoresistance (TMR) effects, ranging from tens to 10,000%, were observed.

Conclusions:

  • Chemically functionalized ferromagnetic electrodes can be successfully integrated into spintronics devices.
  • Self-assembled monolayers provide a viable route for molecular engineering of spintronics.
  • This approach opens new possibilities for designing advanced spintronic functionalities.