A computational model of organic semiconductor spin valves

ORAL

Abstract

A computational model has been developed of a spin valve where a spin sandwich is formed by two ferromagnetic electrodes and an organic semiconductor in the middle of the sandwich. Monomers are randomly placed in the central region of the sandwich and a genetic algorithm simulates the random movement of the monomers until they reach a polymer linear chain, optimizing a screened Coulomb Potential in energy space. Afterwards, spontaneous magnetization is simulated by a genetic algorithm that optimizes an Ising Hamiltonian in energy space. This way a remarkable enhancement of about 4300\% in magnetization is obtained when electrode spins are parallel compared to the magnetization of the antiparallel array. This is in qualitative agreement with a experimental study of pyrochlore oxide superconductor KOs$_2$O$_6$. A.B. acknowledges funding from CONACYT Project 58939.

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Authors

  • Armando Barranon

    Dept. of Basic Sciences, UAM-A, Mexico City

  • Kevin Boos

    Angelo State University, Texas State University, San Marcos, SEMATECH, Texas State University, University of Texas at Brownsville, Abilene Christian University, Texas Tech University, University of Texas at Austin, Maypearl High School, Birdville ISD, South Texas Chapter, Health Physics Society, Sam Houston State University, NASA Johnson Space Center, Dept. of Physics, U. de Buenos Aires, Argentina, Dept.of Physics, ESFM-IPN, Mexico City, University of Texas M.D. Anderson Cancer Center, Rutgers University, Texas A\&M University, Istanbul University, University of North Texas, University of Texas at El Paso, Texas Christian University, Lee College, Southern University and A\&M College, Austin Community College, Rapoport Academy, Texas A\&M University, Kingsville, The University of Texas at Arlington, Tyler Junior College, Tarleton State University, Tolar High School, Granbury High School, Lake Highlands High School