Center for Computing Research (CCR)
Center for Computing Research (CCR)

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Creation of nanoscale magnetic fields using nano-magnet arrays

AIP Advances

Sapkota, Keshab R.; Eley, S.; Bussmann, Ezra; Harris, Charles T.; Maurer, Leon; Lu, T.M.

We present the fabrication of nano-magnet arrays, comprised of two sets of interleaving SmCo5 and Co nano-magnets, and the subsequent development and implementation of a protocol to program the array to create a one-dimensional rotating magnetic field. We designed the array based on the microstructural and magnetic properties of SmCo5 films annealed under different conditions, also presented here. Leveraging the extremely high contrast in coercivity between SmCo5 and Co, we applied a sequence of external magnetic fields to program the nano-magnet arrays into a configuration with alternating polarization, which based on simulations creates a rotating magnetic field in the vicinity of nano-magnets. Our proof-of-concept demonstration shows that complex, nanoscale magnetic fields can be synthesized through coercivity contrast of constituent magnetic materials and carefully designed sequences of programming magnetic fields.

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TYPE Journal Article YEAR 2019
DOIOSTIScopus

Engineering Spin-Orbit Interaction in Silicon

Lu, T.M.; Maurer, Leon; Bussmann, Ezra; Harris, Charles T.; Tracy, Lisa A.; Sapkota, Keshab R.

There has been much interest in leveraging the topological order of materials for quantum information processing. Among the various solid-state systems, one-dimensional topological superconductors made out of strongly spin-orbit-coupled nanowires have been shown to be the most promising material platform. In this project, we investigated the feasibility of turning silicon, which is a non-topological semiconductor and has weak spin-orbit coupling, into a one-dimensional topological superconductor. Our theoretical analysis showed that it is indeed possible to create a sizable effective spin-orbit gap in the energy spectrum of a ballistic one-dimensional electron channel in silicon with the help of nano-magnet arrays. Experimentally, we developed magnetic materials needed for fabricating such nano-magnets, characterized the magnetic behavior at low temperatures, and successfully demonstrated the required magnetization configuration for opening the spin-orbit gap. Our results pave the way toward a practical topological quantum computing platform using silicon, one of the most technologically mature electronic materials.

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TYPE SAND Report YEAR 2018
DOIOSTI
Results 26–45 of 45
Results 26–45 of 45
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