14_Spintronics Brooks Tellekamp

14_Spintronics Brooks Tellekamp - Spintronics Fundamentals...

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Spintronics Fundamentals April 25, 2011 Brooks Tellekamp
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2 Outline Atomic Spin Field Spin Effects Parts of a Spintronic Device Spintronic Devices Quantum Possibilities Benefits Issues with Modern Spintronic Technology
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3 Atomic Spin Two discrete states - spin up and spin down Spin indeterminate (useful for quantum computing possibilities) Spin up and spin down electrons have different wavefunctions and different energies in certain materials The nucleus also has an orbital associated spin, which gives rise to spin-orbit interactions http://www.nitt.edu/home/academics/departments/physics/faculty/lecturers/justin/students/magnetic/origin/
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4 Zeeman Effect/Rashba Effect Spin-orbital interactions give rise to different effects. In the presence of a magnetic field, the energy states of fermions such as electrons will split into discrete spectral lines (Zeeman) In the presence of a perpendicular electric field the magnetic moment of the electron shifts and the electron spin and nuclear orbit interact, causing energy states split into distinct states (Rashba) http://www.massey.ac.nz/~uzuelick/Cluster09.pdf
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5 Zeeman Effect/Rashba Effect In Rashba splitting, multiple quantum energy states are created by doping a quantum well asymmetrically This difference in conduction band levels creates a field, called constant inversion asymmetry, which allows the Rashba effect to occur Control of this field allows electron spin states to be manipulated http://www2.fz-juelich.de/ibn/index.php?index=377
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6 Spin Hall Effect In the presence of a perpendicular electric field, the magnetic moment of spin electrons are modified. The electric and magnetic fields propel the electrons to either side
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14_Spintronics Brooks Tellekamp - Spintronics Fundamentals...

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